defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series Mathematics Permutations and Combinations Fundamental Principles of Counting
Let S = {2, 3, 4, 5, 6, 7, 9}. How many different 3-digit numbers (with all digits different) from S can be made which are less than 500?
1
30
2
49
3
90
4
147