Question

the first and the last term of an AP are -4 and 146 and the sum of Ap 7171. find the number of terms in AP and common diference

Answer 1

Answer:

n=101

d=3/2=1.5

Step-by-step explanation:

See the attachment.

Answer 2

Given that

a= -4

an = 146

Sn = 7171

Sn = n/2(a+an)

1771=n/2(-4+146)

1771=n/2*142

1771=n*71

n=1771/71

n= 24.94