The 20th term from the end of the A.P. 3, 8, 13, ..., 253 is:
Answer & explanation
Correct answer: option 1
The A.P. 3, 8, 13, ..., 253 is
here First Term = 3
Last or nth term of A.P. = 253
Common difference, d = 5
253 = 3 + (n-1)*5
n-1 = 250/5 = 50
n = 51 terms
Thus 20th term from the end is 32nd term
a(32) = 3 + (32-1)*5 = 3 + 31*5 = 158
The correct answer is Option (1) → 158