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Q.

If (1+ax)2(1+ay)2(1+az)2(1+bx)2(1+by)2(1+bz)2(1+cx)2(1+cy)2(1+cz)2 = α(a-b)(b-c)(c-a)(x-y)(y-z)(z-x)

then α3 + α2 -1 =

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a

11

b

12

c

10

d

13

answer is A.

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Detailed Solution

1+a2x2+2ax   1+a2y2+2ay   1+a2z2+2az1+b2x2+2bx1+b2y2+2aby1+b2z2+2bz1+c2x2+2cx1+c2y2+2cy1+c2z2+2cz =1a22a1b22b1c22c,  111x2y2z2xyz =2 (a-b) (b-c) (c-a) (x-y) (y-z) (z-x)   α=2   α3+α2-1=8+4-1                         =11

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