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13 September, 10:32

Find the sum of all 3 digit whole numbers that arw divisible by 13?

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  1. 13 September, 13:28
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    We have an arithmetic sequence with

    a0 = 1st 3-digit number divisible by 13

    a0 = 104

    d = 13 (why?)

    last term is largest divisible by 13 = 988

    how many terms? (988-104) / 13 + 1 = 69

    S = 69/2 (104+988) = 37674
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