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Deepak Bora
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Find the sum of first 15 multiples of 8.

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This is the Important question based on Arithmetic progression Chapter of R.S Aggarwal book for ICSE & CBSE Board.
Here you have to find the sum of first x multiples of given number.
Question Number 13 of Exercise 11 C of RS Aggarwal Solution

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  1. Let to be a is first term and ‘d'” is common Difference and l is last term of Given Arithmetic Sequence or Progression;-
    Arithmetic Sequence or Progression which are given below;-
    Arithmetic Sequence or Progression;-
    8,16,24,32….
    Here,
    First term= 8
    CommOn Difference=8
    Number of terms=15
    We know that Formula of Summation of Arithmetic Sequence or Progression.
    Sn=n/2(2a+(n-1)d)
    S15=15/2(2×8+(15-1)8
    =15/2(16+(14)8)
    =15/2(16+112)
    =15/2 x 128
    =15 x 64
    =960

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