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Let veca, vecb and vecc be three non-cop...

Let `veca, vecb` and `vecc` be three non-coplanar unit vectors such that the angle between every pair of them is `pi//3`. If `veca xx vecb + vecb xx vecc =pveca + qvecb + rvecc`, where p, q and r are scalars, then the value of `(p^(2) + 2q^(2)+ r^(2))/q^(2)` is:

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