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The position vector of a point P is vecr...

The position vector of a point `P` is `vecr=xhati+yhatj+zhatk` where `x,y,zepsilonN` and `veca=hati+hatj+hatk`. If `vecr.veca=10`, then the number of possible position of `P` is

A

36

B

72

C

66

D

54

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The correct Answer is:
A
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