Question

The first term of an a.p. is 5 and the last term is 45 .If the sum of all the terms is 400,the no. Of term is =?

Answer 1

Answer:

number of terms in the AP is 16

Answer 2

Answer:as we know the formula is

sum =n/2 (a+l)

Step-by-step explanation:

A=5 l=45 sum=400

Then use the formula and you got the answer