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veca=2hati+hatj+3hatk , vecb=3hati+3hatj...

`veca=2hati+hatj+3hatk , vecb=3hati+3hatj+hatk & vecc=c_1hati+c_2hatk+c_3hatk,`
`vec a, vec b, vec c` are coplanar, `veca*vecc=5 & vecb` is perpendicular to `vecc`
Find `122 (c_1+c_2+c_3)`

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