In vectors A and B be respectively equal to 3i^−4j^+5k^ and 2i^+3j^−4k^. The unit vector parallel to A + B is 127(5i^−aj^+k^) The value of a is ________

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answer is 1.

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Detailed Solution

A→+B→=5i^-j^+k^ ⇒Unit Vector=1275i^-j^+k^ ⇒a=1

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