Math, asked by shimlarajput4123, 1 year ago

Find the sum of first 15 multiples of 7.

Answers

Answered by garvitpant

27

a=7 d=7 n=15
Sn=n{2a+(n-1)d}/2
=15{14+14×7}/2=15(112)/2=840

Answered by nithiya02123

11

Answer:

7+14+21+28+35+42+49+ 56+ 63+ 70+ 77+ 84+ 91 + 98+ 105+ 112 = 952

Step-by-step explanation:

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