Question

in an A.P ,the first term is -5 and last term is 45. if the sum of all the terms is 120 ,then n is equal to ​

Answer 1

Answer:

6=n

Step-by-step explanation:

a=-5 l=45

120= n/2(a+l)

120=n/2(-5+45)

120=n/2(40)

120= 20n

n 6

Answer 2

Hope it helps u.....!!

Answer:;