Create the sum-of-products expression

Question

Response to the following problem:

Write the Sum-of-products expression for the truth-table of a 2-bit comparator (f₁, f₂, f₃). Notice that a two-bit comparator compares two two-bit numbers N₁ = (x₁x₂) and N₂ = (x₃x₄) and produces the outputs f₁ = 1 when N₁ = N₂, f₂ = 1 when N_{1 2}, and f₃ = 1 when N₁ > N₂.

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