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Please explain why and how the following are true. I. p ?(q?r) is equivalent to (p...

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Advance Math

Please explain why and how the following are true.

I. p ?(q?r) is equivalent to (p ?q)?(p ?r)

II. Let p(x) and p(x) be defined on an random/arbitrary universeof discourse. Why, in words, is (?x)[p(x) ? q(x)] equivalentto[(?x)p (x)] ? [(?x)q(x)]

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