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If the ratio of the coefficient of third...

If the ratio of the coefficient of third and fourth term in the expansion of `(x-1 /(2x)) ^(n)` is : `1:2`,then the value of n will be
`(a) 18`,
`(b) 16` ,
`(c) 12`,
`(d) -10`

A

18

B

16

C

12

D

`-10`

Text Solution

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The correct Answer is:
D
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