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Rajan@2021
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Find the sum of the first 15 multiples of 8.

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This is the basic question from arithmetic progression chapter in which we are to calculate the sum of the first 15 multiples of 8.

Book – RS Aggarwal, Class 10, chapter 5C, question no 15

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1 Answer

  1. The multiples of 8 are 8,16,24,32
    These are in an A.P., having first term as 8 and common difference as 8.
    Therefore, a=8,d=8S15=?

    Sn=n/2[2a+(n1)d]
    S15=15​/2[2(8)+(151)8]

    =15/2[16+(14)(8)]
    =15/2×128
    =960

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