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Find the value of k for which (1, 1), (3...

Find the value of k for which (1, 1), (3, 2) (4, k) is collinear.

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To be conllinear
`|{:(1,1,1),(3,2,1),(4,k,1):}|=0`
`R_3toR_3-R_1, R_2toR_2-R_1`
`|{:(1,1,1,),(2,1,0),(3,k-1,0):}|=0`
`rArr2k-2-3=0`
`rArrk=5/2`
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