Question

Draw a tree diagram to find the number of possible outcomes.

How many 3-digit numbers can be formed from the digits 1, 2, 3, and 4 if no digit is repeated in any number? How mang of these numbers are odd? How many are greater than 300? How many arr divisible by 11?

Answer 1

There are 12 odd numbers:

$$123,143,213,231,241,243,$$

$$321,341,413,421,423,431$$

There are 12 numbers greater than 300.

$$312,314,321,324,341,342,$$

$$412,413,421,423,431,432$$

There are 4 numbers divisible by 11.

$$132,143,231,341$$