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6 August, 19:44

What is the sum of the first 75 even numbers starting with 2?

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Answers (2)
  1. 6 August, 22:53
    0
    This an arithmetic sequence with first term = 2 and common difference 2

    sum of n terms = (n/2) [2a1 + (n-1) d]

    sum of 75 terms = (75/2) [4 + (75-1) 2) ]

    = 5700
  2. 6 August, 23:40
    0
    The answer should be 150
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