JEE Advanced Model Paper 15 with solutions for online practice

The equation of any plane through the intersection of P1 and P2 is
P1+λP2 = 0
⇒ (2x - y + z — 2) + λ (x + 2y - z - 3) = 0.........(i)
Since, it passes through (3,2,1) ,then
(6-2 + 1 - 2) + λ (3 + 4- 1- 3) = 0
∴ λ = - 1
From eq.(1),
x-3y + 2z + 1 = 0
Which is the required plane