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Question

The value of (xa+b)2(xb+c)2(xc+a)2(xa.xb.xc)4 is

A
1
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B
0
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C
1
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D
None
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Solution

The correct option is C 1
The given expression is:
(x(a+b))2(x(c+b))2(x(a+c))2(xa.xb.xc)4
=(x(2a+2b))(x(2c+2b))(x(2a+2c))(xa+b+c)4
=(x(2a+2b))(x(2c+2b))(x(2a+2c))(x4a+4b+4c)
=(x(2a+2b+2b+2c+2c+2a))(x4a+4b+4c)
=(x(4a+4b+4c))(x4a+4b+4c)=1

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