Question

An AP consists of 50 terms of which 3rd term is 12 and the last term is 106 find the 25 term.​

Answer 1

a + 2d = 12

a = 12 - 2d

a + 49d = 106

12 - 2d + 49d = 106

12 + 47d = 106

47d = 106 - 12

47d = 94

d = 94/47

d = 2

a = 12 - 2d

= 12 - 4

= 8

a25 = a + 24d

= 8 + 48

= 56

Hope it will help you

Answer 2

Correct option is

Correct option isA

Correct option isA64

Correct option isA64a+2d=12

Correct option isA64a+2d=12a+49d=106

Correct option isA64a+2d=12a+49d=106⇒47d=94

Correct option isA64a+2d=12a+49d=106⇒47d=94⇒d=2

Correct option isA64a+2d=12a+49d=106⇒47d=94⇒d=2a+4=12

Correct option isA64a+2d=12a+49d=106⇒47d=94⇒d=2a+4=12⇒a=8

Correct option isA64a+2d=12a+49d=106⇒47d=94⇒d=2a+4=12⇒a=829th term : - 

Correct option isA64a+2d=12a+49d=106⇒47d=94⇒d=2a+4=12⇒a=829th term : - a+28d=8+56=64