NDA Government Jobs Exams

If the magnitude of a b
r r × equals to a·b
r r , then which one of the following is correct ?

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NDA Other Question

For any vector α r , what is kˆ ) kˆ . ( jˆ ) j ˆ . ( iˆ) iˆ (α. + α + αr r r equal to If | a | = sqrt2 , | b | = sqrt(3)
and | a + b | = sqrt(6)
, then what is | a- b | equal to