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Intermediate Math Circles - When You Arrive If you have been here before Check your name on the attendance sheet Pick up this weeks handout While you are waiting try this question. Find the sum of the following series. 22 + 23 + 24 + 25 +

  1. Intermediate Math Circles - When You Arrive If you have been here before Check your name on the attendance sheet Pick up this week’s handout While you are waiting try this question. Find the sum of the following series. 22 + 23 + 24 + 25 + · · · + 49 + 50 We will start very close to 6:30. Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  2. Intermediate Math Circles November 26, 2014 Jeff Anderson CIMC Solutions and Cool Questions Centre for Education in Mathematics and Computing Faculty of Mathematics University of Waterloo Waterloo, Canada www.cemc.uwaterloo.ca jeff.anderson@uwaterloo.ca November 26, 2014 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  3. Intermediate Math Circles - Night at a Glance 1 Look at some Math to do our Warmup Question. 2 Take up 2 CIMC Questions. 3 Look at some Brain Math to keep you sharp. • Start promptly at 6:30, End 8:30, Break 10 minutes near 7:30 • Washrooms are located to the left and right. Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  4. Intermediate Math Circles - Reminders Topics Tonight is the last session for the Fall. Math Circles will resume on February 4 Please sign the list on the table if you are not coming back in February. Pascal, Cayley, Fermat Contests February 24 Fryer, Galios, Hypatia April 16 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  5. Johann Carl Friedrich Gauss Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  6. Johann Carl Friedrich Gauss 1 Lived from 1777-1855. Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  7. Johann Carl Friedrich Gauss 1 Lived from 1777-1855. 2 Gauss was a German Mathematician and Physical Scientist. Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  8. Johann Carl Friedrich Gauss 1 Lived from 1777-1855. 2 Gauss was a German Mathematician and Physical Scientist. 3 Contributed to number theory, statistics, differential geometry, geophysics, electrostatics, optics and astronomy. Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  9. Johann Carl Friedrich Gauss 1 Lived from 1777-1855. 2 Gauss was a German Mathematician and Physical Scientist. 3 Contributed to number theory, statistics, differential geometry, geophysics, electrostatics, optics and astronomy. 4 Recommended Sophie Germain to receive her honorary degree. Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  10. Johann Carl Friedrich Gauss 1 Lived from 1777-1855. 2 Gauss was a German Mathematician and Physical Scientist. 3 Contributed to number theory, statistics, differential geometry, geophysics, electrostatics, optics and astronomy. 4 Recommended Sophie Germain to receive her honorary degree. 5 Has a CEMC math contest for Grade 7 and 8 students named after him. Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  11. But my favourite Gauss story is..... Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  12. But my favourite Gauss story is..... S = 1 + 2 + 3 + + 99 + 100 · · · Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  13. But my favourite Gauss story is..... S = 1 + 2 + 3 + + 99 + 100 · · · S = 100 + 99 + 98 + + 2 + 1 · · · Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  14. But my favourite Gauss story is..... S = 1 + 2 + 3 + + 99 + 100 · · · S = 100 + 99 + 98 + + 2 + 1 · · · 2S = 101 + 101 + 101 + + 101 + 101 · · · Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  15. But my favourite Gauss story is..... S = 1 + 2 + 3 + + 99 + 100 · · · S = 100 + 99 + 98 + + 2 + 1 · · · 2S = 101 + 101 + 101 + + 101 + 101 · · · 2S = 100(101) Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  16. But my favourite Gauss story is..... S = 1 + 2 + 3 + + 99 + 100 · · · S = 100 + 99 + 98 + + 2 + 1 · · · 2S = 101 + 101 + 101 + + 101 + 101 · · · 2S = 100(101) 100(101) S = 2 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  17. But my favourite Gauss story is..... S = 1 + 2 + 3 + + 99 + 100 · · · S = 100 + 99 + 98 + + 2 + 1 · · · 2S = 101 + 101 + 101 + + 101 + 101 · · · 2S = 100(101) 100(101) S = 2 S = 5050 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  18. More Gauss. But then Gauss went further... Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  19. More Gauss. But then Gauss went further... S = 1 + 2 + + (n-1) + n · · · Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  20. More Gauss. But then Gauss went further... S = 1 + 2 + + (n-1) + n · · · S = n + (n-1) + + 2 + 1 · · · Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  21. More Gauss. But then Gauss went further... S = 1 + 2 + + (n-1) + n · · · S = n + (n-1) + + 2 + 1 · · · 2S = n+1 + n+1 + + n+1 + n+1 · · · Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  22. More Gauss. But then Gauss went further... S = 1 + 2 + + (n-1) + n · · · S = n + (n-1) + + 2 + 1 · · · 2S = n+1 + n+1 + + n+1 + n+1 · · · 2S = n(n+1) Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  23. More Gauss. But then Gauss went further... S = 1 + 2 + + (n-1) + n · · · S = n + (n-1) + + 2 + 1 · · · 2S = n+1 + n+1 + + n+1 + n+1 · · · 2S = n(n+1) n ( n + 1) S = 2 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  24. More Gauss. But then Gauss went further... S = 1 + 2 + + (n-1) + n · · · S = n + (n-1) + + 2 + 1 · · · 2S = n+1 + n+1 + + n+1 + n+1 · · · 2S = n(n+1) n ( n + 1) S = 2 The sum of the first n natural numbers is n ( n + 1) 2 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  25. Practice Problems Find the sum of the natural numbers from 1 to 2014. Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  26. Practice Problems Find the sum of the natural numbers from 1 to 2014. 2014(2015) = 2029105 2 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  27. Warmup Problem Evaluate 22 + 23 + 24 + 25 + · · · + 49 + 50 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  28. Warmup Problem Evaluate 22 + 23 + 24 + 25 + · · · + 49 + 50 = (1 + 2 + · · · + 49 + 50) − (1 + 2 + · · · + 20 + 21) Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  29. Warmup Problem Evaluate 22 + 23 + 24 + 25 + · · · + 49 + 50 = (1 + 2 + · · · + 49 + 50) − (1 + 2 + · · · + 20 + 21) = 50(51) − 21(22) 2 2 = 1275 − 231 = 1044 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  30. Practice Problems Find the sum of all multiples of 5 from 5 to 2015. i.e. Sum 5 + 10 + 15 + · · · + 2010 + 2015 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  31. Practice Problems Find the sum of all multiples of 5 from 5 to 2015. i.e. Sum 5 + 10 + 15 + · · · + 2010 + 2015 = 5(1 + 2 + 3 + · · · + 402 + 403) = 5 × 403(404) 2 = 407030 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  32. Proof by Induction 1 First we show it works to start. i.e. Works for 1. RS= 1(1+1) LS=1 = 1 2 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  33. Proof by Induction 1 First we show it works to start. i.e. Works for 1. RS= 1(1+1) LS=1 = 1 2 2 Assume it works for k . i.e. 1 + 2 + 3 = · · · + ( k − 1) + k = k ( k +1) 2 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

  34. Proof by Induction 1 First we show it works to start. i.e. Works for 1. RS= 1(1+1) LS=1 = 1 2 2 Assume it works for k . i.e. 1 + 2 + 3 = · · · + ( k − 1) + k = k ( k +1) 2 3 Use the assumption to prove it works for k + 1. i.e. 1 + 2 + 3 = · · · + k + ( k + 1) = ( k +1)( k +2) 2 Jeff Anderson CIMC Solutions and Cool Questions Intermediate Math Circles November 26, 2014

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