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If vector a and b are vectors such that vector |a + b| = √29 and vector a x(2 i + 3 j + 4 k) = (2 i + 3 j + 4 k) x b , then possible values of

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If vector a and b are vectors such that vector |a + b| = √29 and vector a x(2 i + 3 j + 4 k) = (2 i + 3 j + 4 k) x  b , then possible values of vector (a + b).(-7i + 2j + 3k) is

(a)  0

(b)  3

(c)  4

(d)  8 

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Correct option  (c) 4

Explanation:

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