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Find the Cartesian equation of the follo...

Find the Cartesian equation of the following planes :
a. `vec(r). (hati + hatj - hatk ) = 2 `
b. `vec(r). (2 hati + 3 hatj - 4 hatk ) = 1 `
(c ) ` vec(r). [ (s - 2t) hati + (3 - t ) hatj + (2 s + t ) hatk]` = 15

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The correct Answer is:
15
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