The total number of numbers that can be formed by using the digits 5,3 and 7 only, if no repetitions are allowed, is:
Explanation
Solution
Step 1: Case 1 - One-digit numbers
Step 2: Case 2 - Two-digit numbers
Step 3: Case 3 - Three-digit numbers
Step 4: Total calculation
Final Answer:
The total number of numbers is 15, which corresponds to Option 3.
Explanation
Solution
Step 1: Case 1 - One-digit numbers
Step 2: Case 2 - Two-digit numbers
Step 3: Case 3 - Three-digit numbers
Step 4: Total calculation
Final Answer:
The total number of numbers is 15, which corresponds to Option 3.