Question

Sum of 15 terms of an ap is 306
find 8th term
If first term is 6 what is common difference
Write the algebraic expression

Answer 1

S15=306

S15=15\2(2(6)+(15-1)d)--------------------(a=6  is given)

15\2(12+14d)=306                (∵S15=306)

15(6+7d)=306

6+7d=306\15

7d=20.4-6

d=14.4\7

d=2.05≈2