Question

How many 3-digit numbers more than 600 can be formed by using the digits 2, 3, 4, 6, 7?

Answer 1

432
423
467
476
623
632
634
643
723
732
746
764

Answer 2

Step-by-step explanation:

Sol: In the three digit number first digit can be accupied with 6 or 7 i.e 2 ways, second digit can be accupied with 2 or 3 or 4 or 6 or 7 i.e 5 ways and third digit can be accupied with 2 or 3 or 4 or 6 or 7 i.e 5 ways. ∴ total number of ways = 2 x 5 x 5 = 50 ways.