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ISI2015DCG21
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The value of the term independent of $x$ in the expansion of $(1x)^2(x+\frac{1}{x})^7$ is
$70$
$70$
$35$
None of these
isi2015dcg
permutationandcombination
binomialtheorem
asked
Sep 18, 2019
in
Combinatory
by
gatecse
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recategorized
Nov 14, 2019
by
Lakshman Patel RJIT

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$(x+a)^{n}$=$\sum \binom{n}{r} x^{nr} a^{r}$ put x power zero find r then put r in equations
Ans=70
answered
Sep 21, 2019
by
amit166
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