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यदि |vec a| = 7, |vec a-vec b | = 8 तथा...

यदि `|vec a| = 7, |vec a-vec b | = 8` तथा `|vec a +vec b| = 10`, तब `|vec b|=`

A

`12 `

B

`sqrt(57)`

C

`sqrt (33 )`

D

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The correct Answer is:
C
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MOTION-VECTOR -EXERCISE - 1
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