ISRO Dec 2017 Question Paper Complete Solution
Q 10. If vector 𝑎 ⃗ = 2𝑖 ̂ + λ𝑗 ̂ + 𝑘 ̂ and 𝑏 ⃗ = 𝑖 ̂ - 2𝑗 ̂ + 3𝑘 ̂ are perpendicular to each other, then value of λ is
(a) 2/5
(b) 2
(c) 3
(d) 5/2
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