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

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We have asked to find the sum of first 15 multiples of 8.

Sir please give me a detailed solution of this question

ML Aggarwal Avichal Publication

Arithmetic Progression Chapter 9 Question no 19 ii

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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=8, S15​=

    Sn​=2n​[2a+(n−1)d]

    S15​=215​[2(8)+(15−1)8]

     
    =215​[16+(14)(8)]
     
    =215×128​
    =960

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