Suppose that a +b+c= d.where a, b, c, d are nonnegative integers. Let P be the assertion that d is even, let W be the assertion that exactly one among a, b, c are event, and let T be the assertion that all three a, b, c are even. How many cases would you need to consider to prove that P → W V T| if the cases were determined by the number of even terms in the expression a +b+c?

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