Question

in an AP the first term is -5 the last term is 45 if sum of all number in the ap is 120 then how many terms are there ??what is the common difference??​

Answer 1

Here is your answer ⤵⤵⤵⤵

Let a be the first term of this AP

and d be the common difference

a = -5

l = 45

Sn = 120

Sn = n/2(a+l)

=> n/2(-5+45) = 120

=> 40n = 240

=> n = 240/40

=> n = 6

an = 45

=> a+(n-1)d = 45

=> -5+(6-1)d = 45

=> 5d = 45+5

=> d = 50/5

=> d = 10

HOPE IT HELPS YOU ☺☺ !!!

Answer 2

HEY MATE HERE IS UR ANSWER

HOPE IT HELPS !!