Question

It the first term is 2 and sum to n term is 155 in a Ap Find the common difference

​

Answer 1

Answer:

there are nothing common between 2 and 155

Answer 2

Step-by-step explanation:

Given :

First term ( a ) = 2

Sum of n terms (Sn) = 155

Last term (l) = 29

To find :

Common difference (d) = ??

Sum = n/2 (a+l)

155= n/2 (2+29)

155= n/2*31

155*2= 31n

n= 155*2/31

n= 10.

An =a+(n-1)d

29= 2+(10-1)d

29-2= 9d

27=9d

d=3

Hope it will help u..