Question

The combination for opening a safe is a four-digit number made up of different digits. How many different comninations can you make, using only add digits?

Answer 1

There are 625 different 4-digit codes only made with odd numbers.

How many different combinations can you make?

To find the total number of combinations, we need to find the number of options for each one of the digits.

There are 4 digits, such that each digit can only be an odd number.

• For the first digit, there are 5 options {1, 3, 5, 7, 9}
• For the second digit, there are 5 options {1, 3, 5, 7, 9}
• For the third digit, there are 5 options {1, 3, 5, 7, 9}
• For the fourth digit, there are 5 options {1, 3, 5, 7, 9}

The total number of different combinations is given by the product between the numbers of options, so we have:

C = 5*5*5*5 = 625.

There are 625 different 4-digit codes only made with odd numbers.

If you want to learn more about combinations:

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