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Find the 20th term from the last term of the AP: 3, 8, 13, …, 253.
Given:
Given A.P. is $3, 8, 13,…, 253$.
To do:
We have to find the 20th term from the last term of the given AP.
Solution:
In the given A.P.,
$a_1=3, a_2=8, a_3=13$
First term $a_1 = a= 3$, last term $l = 253$
Common difference $d = a_2-a_1 = 8 - 3 = 5$
We know that,
nth term from the end is given by $l - (n - 1 ) d$.
Therefore,
20th term from the end $= 253 - (20 - 1) \times 5 = 253 - 19 \times 5 = 253 - 95 = 158$.
The 20th term from the end of the given A.P. is $158$.  
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