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J & K CET Engineering J and K - CET Engineering Solved Paper-2010

  • question_answer
    The sum of the coefficients in the expansion of \[{{(1+x-3x)}^{143}}\] is

    A)  \[-1\]               

    B)  \[1\]

    C)  \[-3\]               

    D)  \[-7\]

    Correct Answer: A

    Solution :

    Let \[f(x)={{(1+x-3x)}^{143}}\] Sum of the coefficient in the expansion of \[{{(1+x-3x)}^{143}}=f(1)={{(1+1-3)}^{143}}=-1\]


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