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+2 votes

The value of the term independent of $x$ in the expansion of $(1-x)^{2}(x+\frac{1}{x})^{7}$ is

  1. $-70$
  2. $70$
  3. $35$
  4. None of these
in Combinatory by Boss (17.5k points)
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1 Answer

+1 vote


The only term independent of x will be coefficient of $(-2x)(^7C_3(1/x))$

$\implies -2\times ^7C_3=-70$
by Boss (13.1k points)
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