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Q.

If 1+x+x2n=c0+c1x+c2x2+, then the value of c0c1c1c2+c2c3 is

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a

(1)n

b

0

c

2n

d

3n

answer is B.

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Detailed Solution

c0+c1x+c2x2++c2nx2n=1+x+x2n(1)

Replacing x by 1x we get c0c1x+c2x2c3x3++c2nx2n=x2x+1nx2n(2)

Multiplying (1) and (2) we get

c0+c1x+c2x2++c2nx2nc0c1x+c2x2c3x3++c2nx2n=x4+x2+1nx2n

c0c1c1c2+c2c3=coef.1x in x4+x2+1nx2n=coef.x2n1 in x4+x2+1n=0

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