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Find the value of lamda if three vectors...

Find the value of `lamda` if three vectors `vec(a) = 2hat(i) - hat(j) + hat(k), vec(b) = hat(i) + 2hat(j) - 3hat(k) and vec(c) = 3hat(i) + lamda hat(j) + 5hat(k)` are coplanar

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The correct Answer is:
`lamda = -4`
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