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Q.

The term independent of x in the expansion of (1x)2.x+1x10  is

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a

11C5

b

10C5

c

10C4

d

10C3

answer is A.

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Detailed Solution

(1x)2.x+1x10

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consider

x+1x10

Tr+1=10Crx10r1xr
=10Crx102r102r=0r=5

 const term=10C5

For 1x term 102r=1

r=112(not  possible)

For 1x2 term 102r=2

12=2rr=61x2coefficient=10C6

 Independent term =1×10C5+1×10C6

=10C5+10C6

=11C6[nCr+nCr1=n+1Cr]

=11C5

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