Answer :
Given cross product is zero i.e 0i + 0j + 0k
∴ (i + 3j + 9k) x (3i - λj + μk)
⇒ 
⇒ i(3μ - ( - 9λ) + j(μ - 27) + k( - λ - 9) = 0i + 0j + 0k
⇒ μ - 27 = 0 ⇒ μ = 27
⇒ - λ - 9 = 0 ⇒ λ = - 9
∴ Value of μ and λ are 27 and - 9 respectively.
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