The Question is from Arithmetic progression....Answer fast plzzz...
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Given:: t8 = 15
i.e.
a+7d=15 -----(1)
we have to find S15
S15=n/2 [2a +(n-1)d]
=15/2 [ 2a+14d]
= 15/2 × 2[a+7d] ...taking 2 common
= 15 × 15 .....from (1)
= 225 .
Sum of first 15 terms is 225
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which subject it is tell me please
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