[C] Prove: For all positive integers k, if the sequence sk : (k− 1)(k), k(k), (k+1)(k) is graphical, then k is even.

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A: since 4=2.2 ;  6=2.3  ; -4=2.(-2) ; 5=2.2+1 ; 7=2.4-1 or 7=2.3+1

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A: 1st we will simplify  equations given and then use  cramers rule to solve it

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