We can choose the first digit as 4, 5, or 6. That's 3 ways. We can choose the second digit as any of the remaining 4 ways. We can choose the third digit as any of the remaining 3 ways. We can choose the fourth digit as either of the remaining 2 ways. We must choose the fifth digit as the only remaining 1 way. Answer: 3 = 48 ways. Edwin