Question

If the first term of an A.P. is 4 , last term is 40 and the sum is 550 , then find the common

difference.​

Answer 1

Answer:

Hello....

a=4

L=40

S=550

As we know,

S=n/2(a+l)

550=n/2(4+40)

550=22n

n=25

Now,

L=a+(n-1)d

40=4+24d

d=36/24

d=1.5

Thanks... ❤️