Math, asked by gursharanpreetsingh, 1 year ago

find the sum of first 15 mutiples of 7

Answers

Answered by sanjay6448

1

a=7 d=7 n=15

Sn=n÷2×2a+(n-1)d

put the value

Sn=15÷2(2(7)+(15-1)7

Sn=15÷2(14+98)

Sn=15×56

Sn=840

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