(on 14. 2 24(6) 25 125 n= n = 1 16. Use mathematical induction to prove the formula 3+6+9+ . . . + 3n= 3n(n
(on 14. 2 24(6) 25 125 n= n = 1 16. Use mathematical induction to prove the formula 3+6+9+ . . . + 3n= 3n(n + 1) 2 17. Use the Binomial Theorem to expand and simplify (2a - 5b)4. In Exercises 18-21, evaluate the expression. 18. , C3 19. 20 C3 20. 9P2 21. 70 P3
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