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Question: If 3 + <img src="https://cdn.pureessence.tech/canvas_272.png?top_left_x=900&top_left_y=1609&width=26...

If 3 + + + ......... ¥ = 8 then d equals –

A

1

B

5

C

9

D

None of these

Answer

9

Explanation

Solution

This is an A.G.P. \ 31−1/4\frac { 3 } { 1 - 1 / 4 } + d×1/4(1−1/4)2\frac { d \times 1 / 4 } { ( 1 - 1 / 4 ) ^ { 2 } } = 8

̃ 4 + 4d9\frac { 4 d } { 9 } = 8 ̃ d = 9