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If p = bxc/[a, b, c] , q = (c x a/[a,b,c]), r = (a x b/[a, b, c]), where a,b and c are three non-coplanar

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If p = bxc/[a, b, c] , q = (c x a/[a,b,c]), r = (a x b/[a, b, c]), where a,b and c are three non-coplanar vectors, then the value of the expression (a + b + c) (p + q + r) is

(a) 3

(b) 2

(c) 1

(d) 0

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Correct option (a) 3

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