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Question

If ∣ ∣ ∣xkxk+2xk+3ykyk+2yk+3zkzk+2zk+3∣ ∣ ∣=(xy)(yz)(zx)(1x+1y+1z), then

A
k = 2
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B
K = -1
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C
k = 0
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D
k = 1
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Solution

The correct option is B K = -1
∣ ∣ ∣xkxk+2xk+3ykyk+2yk+3zkzk+2zk+3∣ ∣ ∣
=xk.yk.zk(xy)(yz)(zx)(xy+yz+zx)=(xyz)k+1(xy)(yz)(zx)(1x+1y+1z)k+1=0k=1

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