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The sum of the first n positive integers is

Mathematics
JAMB 2006

The sum of the first n positive integers is

  • A. 1/2 n(n-1)
  • B. n(n+1)
  • C. n(n-1)
  • D. 1/2 n(n+1)
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Correct Answer: Option D
Explanation

Let the positive integers be 1, 2, ,3, 4, .....n
∴ a = 1, d = 1 and n = n
Sn = n/2(2a + (n-1)d)
= n/2 (2 + n – 1)
= 1/2n(n + 1)

There is an explanation video available below.

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Explanation Video

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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