NDA Government Jobs Exams

If | a | = sqrt2 , | b | = sqrt(3)
and | a + b | = sqrt(6)
, then what is | a- b | equal to

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NDA Other Question

If the magnitude of a b
r r × equals to a·b
r r , then which one of the following is correct ? Which one of the following vectors is normal to the vector kˆ+ jˆ +iˆ