For the message word a₁ a₂ a₃ a₄, append four check digits c₁= a₁, c_{2 =}a₂, c₃= a₃ and c₄= a₄. Will the resulting code detect and correct all single-digit errors? Can double errors be detected and corrected?

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The Answer of For the message word a₁ a₂ a₃ a₄, append four check digits c₁= a₁, c_{2 =}a₂, c₃= a₃ and c₄= a₄. Will the resulting code detect and correct all single-digit errors? Can double errors be detected and corrected?

For the Message Word A1 A2 A3 A4, Append Four

For the Message Word A₁ A₂ A₃ A₄, Append Four