Let →a=2^i−3^j+4^k and →b=7^i+^j−6^k If →r×→a=→r×→b, – InterviewSolution

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1.	Let →a=2^i−3^j+4^k and →b=7^i+^j−6^k If →r×→a=→r×→b,→r⋅(^i+2^j+^k)=−3, then →r⋅(2^i−3^j+^k) is equal to:
Answer» Let $\to a = 2^i - 3^j + 4^k$ and $\to b = 7^i +^j - 6^k$ If $\to r \times \to a = \to r \times \to b, \to r \cdot (^i + 2^j +^k) = - 3,$ then $\to r \cdot (2^i - 3^j +^k)$ is equal to:

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