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Question

If A = (1,1,1) and C = (0,1,1) are given vectors, then find a vector B satisfying the equation A×B=CandA.B=3

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Solution

A×B=C
A×(A×B)=A×C
(A.B)A(A.A)B=A×C
3A3B=A×C
A×C=∣ ∣ ∣^i^j^k111011∣ ∣ ∣
=^i(0)+^j(1)+^h(1)
=^j+^k
3B=3(^i+^j+^k)(^j+^k)
3B=3^i+4^j+2^k
B=^i+43^j+23^k

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