Question

Find the ${10}^{th}$ term from the end of the A. P. 4,9,14,........... , 254.

Answer 1

Given
AP- 4,9,14........254
Last term of AP is 254
Since it is been asked to find the 10th term from end;
For the reverse AP, a=254
d= -5 , n=10
$a_n=a+(n-1)d$
$a_{10}=254+(10-1)(-5)$
= 254-45
= 209