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An AP co sists of 50 terms of which 3rd term is 12 and the last term is 106.Find the 29th term.

Posted by Aayush Taxak 5 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Naina Goyal 5 years, 10 months ago

A3= 12 with the help of this a+ 2d = 12 equation 1. Ap = 50 a50 = 106 again with the help of this a+ 49d =106 equation 2 And solve these equation y get the ans

0Thank You

Jaimina Gharia 5 years, 10 months ago

n = 50 a3 = 12 -> a + 2d = 12 ->a = 12 - 2d l = 106 an =a + (n-1) d 106 = a + (50-1)d 106 = 12 - 2d+ 49d 106-12=47d 94=47d d=94÷47=2 d=2 a=12-2(2) a=12-4 a=8 a29= a+28d a29=8+28(2) a29=8+56 a29=64 Your answer is 64

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