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Q.

The first three terms in the expansion of 1+x+x210 are

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a

1,5x,11x2

b

1,10x,15x2

c

1,10x,55x2

d

1,15x,50x2

answer is C.

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Detailed Solution

1+x+x210=10C0(1+x)10+10C1(1+x)9x2+..=1+10C1x+10C2x2+..+101+9C1x+9C2x2+..x2=1+10x+55x2+..
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