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Question : 4 of 120
Marks:
+1,
-0
Solution:
Let,
=λ+(1+λ)+(1+2λ) =(1−λ)+λ+2 Given a and b are perpendicular,
∴.=0 ⇒λ(1−λ)+(1+λ)(λ)+(1+2λ)(2)=0 ⇒λ−λ2+λ+λ2+2+4λ=0 ⇒6λ=−2 ⇒ λ = -(1/3)
Hence, option (1) is correct.
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