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I = I₁ - I₂ = 31-20
I = I₁ - I₂ = 11
I₁ = 2 x 1₂
= 2 x 11 = 22
I = I₁ + 20
I = 22 + 20 = 42
I₂ = 42 - 20 +11
I₂ = 42 - 31
I₂ = 11