find the 20th term from the last term of AP 3,8,13..........253
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Find the 20th term from the last term of AP 3,8,13.....253.
We have, the last term (l) = 253
Here, d = 8 - 3 = 5
Since, then n term before the last term is given by l - (n - 1)d
Therefore, We have 20th term from the last term
=> l - (20 - 1) × 5
=> 253 - 19 × 5
=> 253 - 95
=> 158
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