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Let veca, vecb and vecc be three vector...

Let `veca, vecb` and `vecc` be three vectors such that `|vecb| =2|veca|` and `3|veca|`.The Angle between each pair of vectors is 60° such that `|veca +2vecb+3vecc| = sqrt(21)`, then `sqrt(7)|vecc|` is equal to:

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