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In Peano's axioms, the successor of a natural number x is which?
A2x, an even number
Bx - 1, a natural number
Cx squared, a perfect square
Dx + 1, a natural number
Answer & Solution
Correct answer: D. x + 1, a natural number
The successor function s gives s(x) = x + 1, which is again a natural number.
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