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If the vectors vec (a) = 2 hat (i) - ha...

If the vectors ` vec (a) = 2 hat (i) - hat (j) + hat (k) , vec ( b) = hat (i) + 2 hat (j) - 3 hat (k) and vec(c ) = 3 hat (i) + lambda hat (j) + 5 hat (k) ` are coplanar , find the value of `lambda`

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