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Q.

The coefficient of x5 in the expansion of 1+x25(1+x)4 is

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a

30

b

40

c

50

d

60

answer is D.

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Detailed Solution

1+x25(1+x)4=1+5x2+10x4+…1+4x+6x2+4x3+…∴ Coefficient of x5 is (5)(4) + (4)(10) = 60
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