Q. 234.6( 8 Votes )

What is 20th term from the end of the AP 3, 8, 13, ..., 253?
A. 163

B. 158

C. 153

D. 148

Answer :

Here, First term = a = 3


Common difference = d = 8 - 3 = 5


Last term = l = 253


To find: 20th term from end.


So, nth term from end is given by:


an = l - (n - 1)d


20th term from end is:


a20 = 253 - (20 - 1) × 5


= 253 - 95


= 158


20th term from the end is 158.

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