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If vecr*hati=2vecr*hatj=4hatr*hatk and |...

If `vecr*hati=2vecr*hatj=4hatr*hatk and |vecr|=sqrt(84),` then the value of `vecr*(2hati-3hatj+hatk)` may be

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NTA MOCK TESTS-JEE MOCK TEST 15-MCQS (MATH)
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