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The position vectors of P and Q are 5hat...

The position vectors of P and Q are `5hati+4hatj+ahatk`and `-hati+2hatj-2hatk`respectively.If the distance between them is 7,then the value of a will be

A

a)-5,1

B

b)5,1

C

c)0,5

D

d)1,0

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