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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

`1/3`

B

2

C

3

D

`1/2`

Text Solution

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The correct Answer is:
C
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