Find the sum of first 18 terms of AP whose first term is 5 and Common difference is 2

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Find the sum of first 18 terms of AP whose first term is 5 and Common difference is 2

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Samantha 1 week 2021-09-11T03:59:20+00:00 1 Answer 0 views 0

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    2021-09-11T04:00:27+00:00

    a= 5

    d= 2

    n=18

    by formula…

    Sn = n/2 [2a+(n-1)d]

    Sn = 18/2[ 2× 5+(18-1)2]

    Sn = 9[10+17 × 2]

    Sn = 9[ 10+ 34]

    Sn = [ 9× 44]

    Sn =. 396 Answer…

    Hence the sum is 396........

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