Question

Sum of first 7 terms is 140 and sum of first 3 terms of this ap is 30 find ap

Answer 1

Answer:

5,10,15,20,25,30,35...

Step-by-step explanation:

a-3d + a-2d + a-d + a + a+d + a+2d + a+3d = 140

7a = 140

a = 20

a-3d + a-2d + a-d = 30

3a-6d = 30

60 - 6d = 30

d = 5

=> ap = 5,10,15,20,25,30,35,40,45..