Question

the sum of first five terms of A.P.is50 and sum of its next five terms is 125 . write A.P.

Answer 1

Answer:

4,7,10,13,16,19,22,25,28,31

Step-by-step explanation:

let first term be a and common difference be d

first 5 terms are a, a+d, a+2d, a+3d, a+4d

sum = 5a+ 10d = 50

implies a+2d = 10

next five terms are a+5d, a+6d,a+7d,a+8d,a+9d

sum = 5a+ 35d = 125

implies a+7d = 25

Solving both we get a= 4 and d= 3

A.P. is 4,7,10,13,16,19,22,25,28,31 and so on