Que: Suppose that P(n) is a propositional function. Determine for which positive integers n the statement P(n) must be true if: P(1) is true; for all positive integers n, if P(n) is true then P(n+2) is true.

a. P(3)
b. P(2)
c. P(4)
d. P(6)
Answer: P(3)

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