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Question

Find the 20th term from the last term of the AP ,3,8,13,....,253

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Solution

We have,
l = Last term = 253
d = Common difference = 8 - 3 = 5

∴ 20th term from the end = l - (20 - 1)d
= l - 19 d
= 253 - 19 × 5
= 253 - 95
= 158



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