Question

The first term of an AP is 5 the last term is 45 and the sum is 500 what is the nber of terms and common difference​

Answer 1

a=5

an =45

sn=500

sn=n/2(a+an)

500=n/2 (5+45)

500=n/2 (50)

500=25n

n =20

hope it is helpful