. Use mathematical induction to show that 13 + 33 + 5³ +· · .+(2n + 1)³ = (n + 1)²(2n² + 4n + 1) whenever n is a positive integer Use mathematical induction to show that ¬ (pị Vp2 V. · · V pn) is equivalent to ¬p¡^¬p2 1.:A-Pn whenever pj, p2, . . ., Pn are propositions.

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