Question

Find the common difference of an A.P whose first term is 5 and the sum of first four
terms is half the sum of the next four terms.​

Answer 1

Step-by-step explanation:

a=5 ,

a+a+d+a+2d+a+3d =1/2 (a+4d+a+5d+a+6d+a+7d)

2(4a+6d) = 4a+22d

4a+6d = 2a+11d

2a = 5d

5d = 2(5)

d = 2