alleryProof by induction first proves a single:
ACounterexample
BBase case
CFinal case
DAxiom set
Answer & Solution
Correct answer: B. Base case
1. The method proves one starting case.
2. Then it proves that any case implies the next.
3. A counterexample would disprove the claim.
_Source: Wikipedia, "Mathematical_proof" (rev ?), section "Proof by mathematical induction"_
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