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11 April, 19:06

How many terms are in the arithmetic sum 15 + 18 + 21 + ... + 99?

n = 1,653

n = 28

n = 27

n = 29

+1
Answers (1)
  1. 11 April, 19:27
    0
    The n-th term is

    a (n) = 15 + 3 (n-1)

    Then the last term corresponds to the value n that satisfies

    99 = 15 + 3 (n - 1)

    33 = 5 + (n - 1)

    29 = n

    The appropriate choice is ...

    n = 29
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