If (1+x)(1+x^2)(1+x^4)….(1+x^(128))=unde...

If `(1+x)(1+x^2)(1+x^4)….(1+x^(128))=underset(r=0)overset(n)Sigmax^r`, then n is equal is

`256`

`255`

`254`

`257`

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The correct Answer is:

If `(1+x)(1+x^(2))` …………
Degree of `x` on `L.H.S` is `1+2+4+……+128 = 255`

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