p-Block elementsHard

Question

If the lines and are coplanar, then k can have :

Options

A.any value
B.exactly one value
C.exactly two values
D.exactly three values

Solution

⇒      
⇒      
⇒      (1 + 2k) + (1 + k2) - (2 - k) = 0
⇒      k2 + 3k = 0

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