Question

If the first and last term of an



a.P is 5and45.And if the sum of all the terms of an



a.P is 400 find the common difference

Answer 1

Answer:

Step-by-step explanation:

given a=5

& An=45

Sn=400

now using Sn formula

Sn=n/2(a+An)

400=n/2(50)

400=25n

n=400/25

n=16

now using An formula

An=a+(n-1)d

45-5=15d

40=15d

d=40/15

d=8/3

Answer 2

hope this answer will help you.