Introduction to permutations.

1. Permutations or
Why this isn't really
a combination lock.
Project365 - 290 by flickr user MikeNeilson

2. (a) How many numbers of 5 different digits each can be formed
from the digits 0, 1, 2, 3, 4, 5, 6?
(b) How many of these numbers are even?
(c) How many of these numbers are divisable by 5?

3. Simplify

4. How many phone numbers can be made under the
following conditions:
(First digit cannot be 0 or 1 because you'll get the
operator or long distance.)
• The first two digits are 3 followed by 6
• The third digit is even
• The fourth digit is greater than 5
• The fifth and seventh digits are odd
• The sixth digit is 2

5. Permutations
336