NDA Government Jobs Exams

If β
r
is perpendicular to both α r and γ r where kˆ = α r and kˆ 4 jˆ 3 iˆ γ = 2 + + r , then what is β
r
equal to

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NDA Other Question

The general solution of the differential equation ln(dy/dx)+x=0
is For any vector α r , what is kˆ ) kˆ . ( jˆ ) j ˆ . ( iˆ) iˆ (α. + α + αr r r equal to