Question

How many two-digit positive integers can be formed from the digits 1, 5, 6, and 8 if no digit is repeated?

Answer 1

The total number of ways to form a two number without repetition is 12.

Step-by-step explanation:

The given digits are 1, 5, 6 are 8. Total number of digits is 4.

We have to form a two digit number without repeating a digit. So, the total ways to choose a number for first place is 4.

Since repetition is not allowed, therefore the total ways to choose a number for second place is 3.

Total number of ways to form a two number without repetition is

`4* 3=12`

Therefore the total number of ways to form a two number without repetition is 12.