1.

The sum of all the coefficients in the binomial expansion of (1+2x)^n is 6561. Let R=(1+2x)^n=1+F, where 1 in N and 0 lt F lt 1. IF x=1/sqrt2 then 1-F/(1+(sqrt2-1)^4)=

Answer»

`(3sqrt2-4)`
`4(3sqrt2+4)`
`(sqrt2-1)^4`
1

Answer :C


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