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  • general knowledge Online Quiz - 5410
  • Sum of the first 9 positive numbers is?
Multiple choice general knowledge

Sum of the first 9 positive numbers is?

  1. 36

  2. 42

  3. 45

  4. 48

  5. 54

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

The sum of the first n positive integers is given by the formula n(n+1)/2. For n=9: 9(10)/2 = 90/2 = 45. This is a standard arithmetic series formula.

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