1.

vec(a),vec(b) and vec( c ) are three vector vec(a)ne0 and |vec(a)|=|vec( c )|=1,|vec(b)|=4,|vec(b)xx vec( c )|=sqrt(15). If vec(b)-2vec( c )=lambda vec(a) then the value of lambda is ………….

Answer»

`-4`
`-2`
1
3

Answer :A


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