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Let vec a = hat i + hat j + hat k , vec ...

Let `vec a = hat i + hat j + hat k , vec b = hat i ` and `vec c = c_(1)hat i + c_(2)hat j + c_(3)hat k`. If `c_(1) = 1` and `c_(2) = 2` , find `c_(3)` which makes `vec a, vec b` and `vec c` coplanar.

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The correct Answer is:
`therefore c_(3) = 2`
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