1.

If `(1+x)(1+x^2)(1+x^4)….(1+x^(128))=Sigma_(r=0)^(n) x^r`, then n is equal isA. 256B. 255C. 254D. none of these

Answer» Correct Answer - B
Degree of x on L.H.S is
1+2+4+…+128=`1+2+2^(2)+….+2^(7)`
`=(2^(8)-1)/(2-1)=255`


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