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If veca, vecb, vecc are non-coplanar vec...

If `veca, vecb, vecc` are non-coplanar vectors, prove that the following vectors are coplanar.
(i) `3veca - 7vecb - 4vecc, 3veca - 2vecb + vecc, veca + vecb + 2vecc`
(ii) `5veca +6vecb + 7vecc, 7veca - 8vecb + 9vecc, 3veca + 20 vecb + 5vecc`

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