Question

If 8th term of an AP is 15, the Sum of the 15 its term is
(a) 15
(b) 0
(c) 225
(d) 225/2

Answer 1

option (c) is correct.

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Answer 2

Answer:

Step-by-step explanation:

A8 = a+(n-1)d

15 = a+(8-1)d

15 = a+7d

A=15-7d

S15 =n/2 (2a+(n-1) d)

15/2(2( 15-7d)+(15-1)d)

=15/2(30-14d+14d)

=15/2×30 = 225

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