Question

If the 8th term of an ap is 37 and the 15th term is 15 more than the 12th term find the sum of 15 th term

Answer 1

Answer:

Given:-T8=37

T15=T12+15,

a+14d=a+11d+15

Solving the Equation we get,3d=15 or d=5

a+7(5)=37,hence a=2

Sum of 1st 15 terms is:-n/2(2a+(n-1)d)

15/2(2*2+14*5)=555