Question

Find P if, 8 = 3 + 1 4 ( 3 + p ) + 1 4 2 ( 3 + 2 p ) + 1 4 3 ( 3 + 3 p ) + |

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Answer :

Correct answer is : 9

8 = 3 1 1 4 + p 1 4 ( 1 1 4 ) 2 ( sum of infinite terms of A.G.P = a 1 r + d r ( 1 r ) 2 )

4 p 9 = 4

 ⇒ p = 9

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