GED Math Practice Test 2: Algebra And Graphs

In a proof by mathematical induction of a proposition P(n) for all positive integers n, what must be shown in the inductive step?

P(1) is true P(n) is true for n = 1, 2, 3 only P(k) implies P(k-1) If P(k) is true for a positive integer k, then P(k+1) is true

If P(k) is true for a positive integer k, then P(k+1) is true

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