Let →a,→b and →c be three non-coplanar vectors and let →p,→q and →r be the vectors defined by →p=→b×→c[→a→b→c],→q=→c×→a[→a→b→c],→r=→a×→b[→a→b→c]. Then (→a+→b)⋅→p+(→b+→c)⋅→q+(→c+→a)⋅→r=
A
0
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B
1
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C
2
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D
3
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