(:)? /3 9. Which of the following is equal to (b) (–1)"-12·5., 3"n! 3.5-7..... (2n + 1) (Зп — 4) .... (a) (–1)" n2 2 3"n! (3п — 1) 2-5-8 2-5-8... (Зп — 4) ...... (c) (–1)" (d) (–1)": n> 2 3"n! n! (Зп — 2) 3"n! ..... (e) (–1)²-13·5 - 7. -, n >1

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