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Multiple choice general knowledge math & puzzles

sum of squares of first nine natural numbers divided by sum of first nine natural numbers

  1. 19

  2. 3

  3. 19/3

  4. 285

  5. 45

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sum of squares of first n natural numbers is n(n+1)(2n+1)/6. For n=9: 9*10*19/6 = 285. Sum of first n is n(n+1)/2. For n=9: 9*10/2 = 45. 285 / 45 = 19/3.

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