Math, asked by krupanshu7701, 1 year ago

If the first term of an A.p is 5 and sum of its first four term is half of the sum of next four term then find common difference

Answers

Answered by jogender77
0
S4 = 1/2 S8
n/2 ( 2a + ( n - 1 ) d = 1/2[n/2 ( 2a + ( n - 1 ) d]
2a + d = 1/2 ( 2a + d ) (A = 5 )
2(5) + d = 1/2 [2(5) + d]
10 + d = 1/2 [ 10 + d ]
20 + 2d = 10 + d
D = -10
Similar questions