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Find the least positive integral value o...

Find the least positive integral value of x for which the angle betweenn vectors `a=xhati-3hatj-hatk and b=2xhati+xhatj-hatk` is acute.

A

`xgt0`

B

`xlt0`

C

`xgt1only`

D

`xlt-1` only

Text Solution

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The correct Answer is:
B
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