Question

Using all or some of the digits 2, 3, 4 and 5, Edward writes
numbers greater than 500 without repeating digits. For
example, he might write 543
How many numbers does Edward write?​

Answer 1

Answer:

hope it will work you

Step-by-step explanation:

192745

Answer 2

Answer:

30

Step-by-step explanation:

Edward can either write 3 or 4 digit numbers.

To write 3 digit numbers, he must use 5 at the beginning, leaving 2 blank spaces for either 2, 3 or 4.

In the first space there are 3 options of numbers to go there. In the final space  there are only 2 options, since digits can't repeat.

3x2=6

To write 4 digits numbers, he can use any number in any position, but nnot repeating, so:

4x3x2x1=24

6+24=30