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Let a = i + j + k, b = i and c = c1i + c2j + c3k, Then If c1 = -1 and c2 = 2, find c3 which makes vectors a, b and c coplanar.

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Formula:-

Given:-

Now, using

⇒ 0 – 1(c3) + 1(2) = 0

⇒ c3 = 2

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