Question

What is 20th term form the end of the AP 3, 8, 13, …., 253? (a) 163 (b) 158 (c) 153 (d) 148

Answer 1

answer is b that is 158. if correct and like than like and mark as brainlist.

Answer 2

Answer:

( b ) 158

Step-by-step explanation:

As given,

d = 13 - 8 = 8 - 3 = 5

Thus, from the end the series is:

253, 248, 243, 238, ...

Let this series be a1, a2, a3, ...

In this series,

d = 243 - 248 = 248 - 253 = -5

Thus,

an = a1 + ( n - 1 ) d

a20 = 253 + ( 20 - 1 ) ( -5 )

a20 = 253 + ( 19 ) ( -5 )

a20 = 253 - 95

a20 = 158

ANS = ( b ) 158