Question

Give me answer correctly .... I will mark brainlist .

Answer 1

Here is your answer :-

AP = 3, 8, 13 ....... 253

We have to find 20th term from the last term of the AP. So, from last :-

a = 253
d = (-5)
l = 3
n 20 = ?

aⁿ = a + ( n - 1 ) d

➡ a20 = 253 + ( 20 - 1 ) (-5)

➡ a20 = 253 + 19 (-5)

➡ a20 = 253 + (-95)

➡ a20 = 158.

Hope it will help you !!