Utilizand eventual regula produsului, determinati:
a) Cate nr de 2 cifre se pot forma folosind numai cifrele 5 si 7
b) cate nr de 3 cifre se pot forma folosind numai cifrele 2,3 si 4
c) cate numere impare de 4 cifre se pot forma cu nr 1,2,3,4
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