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If veca,vecb and vecc are three vectors ...

If `veca,vecb` and `vecc` are three vectors such that `|veca|= 3, |vecb|=4` and `|vecc|=sqrt(24)` and sum of any two vectors is orthogonal to the third vector , then find `|veca+vecb+vecc|` is equal to k.Find `k`.

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