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If vec(a) = 2hat(i) + 3hat(j) + hat(k), ...

If `vec(a) = 2hat(i) + 3hat(j) + hat(k), vec(b) = hat(i) - 2hat(j) + hat(k)` and `vec(c) = -3hat(i) + hat(j) + 2hat(k)`, then find `[vec(a)vec(b)vec(c)]`.

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The correct Answer is:
`-30`
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