A student wrote (1-x)^-2=1+2x+3x^2+4x^3+...

A student wrote `(1-x)^-2=1+2x+3x^2+4x^3+…….for -2ltxlt2` and got zero marks because (A) `x was allowed to be 0 (B) x was allowed to be -ve (C) x was allowed to have negative as well as positive values (D) `|x|` was greater than 1 for some values of x

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A student wrote `(1-x)^-2=1+2x+3x^2+4x^3+…….for -2ltxlt2` and got zero marks because (A) `x was allowed to be 0 (B) x was allowed to be -ve (C) x was allowed to have negative as well as positive values (D) `|x|` was greater than 1 for some values of x

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