The keypad to the lock to the computer lab has 5 buttons. An access code is a sequence of 3 buttons or 4 buttons. Find the number of access codes: (a) If a button may be repeated. (b) If a button may not be repeated.

(a) 750 codes

(b) 180 codes

Step-by-step explanation:

The number of possible access codes is given by the number of ways to pick 3 out of 5 buttons added to the number of ways to pick 4 out of 5 buttons, in which the order matters.

(a) If a button may be repeated.:

There are 750 possible codes.

(b) If a button may not be repeated.

There are 180 possible codes.

$18 was the price of the t-shirt

step-by-step explanation:

d

gimmee one of those gold crowns!

~coco