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If P(5,6,-1),Q (2,-7,beta ) and R (-1,-2...

If `P(5,6,-1),Q (2,-7,beta ) and R (-1,-20,7) ` are collinear , then `beta = `

A

`2`

B

`3`

C

`5`

D

`0`

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The correct Answer is:
B
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