|(x+1,x+2,x+a),(x+2,x+3,x+b),(x+3,x+4,x+...

`|(x+1,x+2,x+a),(x+2,x+3,x+b),(x+3,x+4,x+c)|=0` where `a,b` and `c` are in AP.

A

3

B

`-3`

C

0

D

none of these

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The correct Answer is:

C

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