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

Posted by ☆°••(Prateek)••° ☆ 5 years, 2 months ago

CBSE > Class 10 > Mathematics

4 answers

☆°••(Prateek)••° ☆ 5 years, 1 month ago

158 is the right answer

0Thank You

Yogita Ingle 5 years, 2 months ago

3,8,13.......,253

To find 20th term form the last term we consider the sequence as follows

a = 253 and d = 3 - 8 = -5

a_n = a + (n - 1)d

a₂₀ = a + (20 - 1)d

= 253 + 19 × (-5)

= 253 - 95

= 158

Hence, the 20th term from the last term is 158.

2Thank You

A . 5 years, 2 months ago

158

1Thank You

Rupesh Choudhary 5 years, 2 months ago

368

1Thank You

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