Math, asked by bj33090, 4 months ago

what is the sum of products of 15 terms if common difference is -1 and first term 14

Answers

Answered by ij20000005

2

Step-by-step explanation:

a = 14, d = -1, n = 15

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

S15 = 15/2(2×14 + (15-1)(-1))

=15/2 ( 28 - 14)

= 15/2 × 14

= 15 × 7

S15 = 105

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