Let →a,→b,→c be three linearly independent vectors then[→a+→2b−→c →2a+→b+→c →4a−→b+→5c][→a →b →c] is
If →a,→b and →c are three non-coplanar vectors, then (→a+→b+→c)⋅[(→a+→b)×(→a+→c)] equals