If the ratio of the coefficient of third and fourth term in the expansion of \[{{\left( x-\frac{1}{2x} \right)}^{n}}\] is 1 : 2, then the value of n will be

If the ratio of the coefficient of third and fourth term in the expans

1.	If the ratio of the coefficient of third and fourth term in the expansion of \[{{\left( x-\frac{1}{2x} \right)}^{n}}\] is 1 : 2, then the value of n will be
A.	18
B.	16
C.	12
D.	-10
Answer» E.

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If the ratio of the coefficient of third and fourth term in the expansion of \[{{\left( x-\frac{1}{2x} \right)}^{n}}\] is 1 : 2, then the value of n will be

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