find the 20th term from the last term of the AP 3 8 13 .... 253
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253=3+(n-1)5
250/5=n-1
50=n-1
n=51
20 term from end
(51-20+1)th term from beginning
32 term
a+31d
3+31×5
158
250/5=n-1
50=n-1
n=51
20 term from end
(51-20+1)th term from beginning
32 term
a+31d
3+31×5
158
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