1.

If the planes λx + 3y - 7z - 1 = 0 and 5x + 6y - μz = 0 are parallel, then the integral part of λ + μ (i.e., λ + μ) is (A) 15 (B) 17 (C) 14 (D) 16

Answer»

Correct option is (D) 16

Explanation :

The planes are parallel. So 

λ/5 = 3/6 = -7/- μ

λ = 5/2, μ = 14 

Therefore, [λ + μ] = [5/2 + 14] = [32/2] = 16



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