Two fair dice are thrown. The numbers on them are taken as λ and μ , and a system of linear…

Two fair dice are thrown. The numbers on them are taken as λ and μ, and a system of linear equations
x+y+z=5

x+2y+3z=μ

x+3y+λz=1
is constructed. If p is the probability that the system has a unique solution and q is the probability that the system has no solution, then:

  1. p=16 and q=536
  2. p=56 and q=136
  3. p=16 and q=136
  4. p=56 and q=536

Solution

11112313λ=λ-5

Δ1=11523μ3λ1=10λ+3μ-λμ-44

Δ2=11513μ1λ1=5λ+μ-λμ-13

Δ3=11512μ131=-2μ+6

For unique solution
λ5,μ{1,2,3,4,5,6}

p=56×1=56
For No Solution
λ=5, μ3

  q=16×56=536

Asked in: JEE Main 2021 (26 Aug Shift 2)

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