Question

Quantos números de 3 algarismos distintos podemos formar utilizando apenas os algarismos 3, 5, 7 e 9 *

Answer 1

333, 335, 337, 339, 353, 355, 357, 359, 373, 375, 377, 379, 393, 395, 397, 399, 533, 535, 537, 539, 553, 555, 557, 559, 573, 575, 577, 579, 593, 595, 597, 599, 733, 735, 737, 739, 753, 755, 757, 759, 773, 775, 777, 779, 793, 795, 797, 799, 933, 935, 937, 939, 953, 955, 957, 959, 973, 975, 977, 979, 993, 995, 997 e 999