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Find the sum of the first …

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Find the sum of the first 15 multiples of 8

    • Posted by Shabana Parween 6 years, 1 month ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Jay Kumar Sharma 6 years, 1 month ago

    First multiple of 8 is 8 8,16,24...... a is 8 d is 8 Sn =n/2[2a+(n-1)d] 15/2[2*8+(15-1)8] 15/2[16+112] =15*64 =960

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