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CBSE XI
>>
Math
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Binomial Theorem
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Q)
The coefficient of the third term in the expansion of
(
x
2
−
1
4
)
n
,when expanded in descending powers of
x
is
31
.Then n is equal to
(
A
)
16
(
B
)
30
(
C
)
32
(
D
)
None of these
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