(11) Let P be the statement: "For all a, b = Z, if a + b is divisible by 10, then a is divisible by 10 and b is divisible by 10." (a) Express P using logic symbols, denoting the set of all multiples of ten by T. (b) Find ¬P, in both logic symbols and in english. (c) Find the contrapositive of P. (d) One of P or P is true. Determine which one, and justify your answer.

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