CBSE BOARD X, asked by haiqah1003, 1 year ago

Find the sum of first 12 multiples of 7

Answers

Answered by jagdish1581

2

here is ur solution

Attachments:

Answered by Aashan

1

A = 7,d = 7 , n = 12

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

=12 /2 (2×7 +(11×7)

=6×(14+77)

=546

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