Help please :P?

Question

QUESTION #1

Four stamps can be attached to each other in various ways. One way is shown here. In how many other ways might four stamps be attached?
☺ ☻ ♥ ♦ <-- Stamps.

QUESTION #2

What is the greatest amount of money you can have (in pennies, nickels, dimes, quarters, and half dollars) and still not be able to give change for a dollar?

QUESTION #3

It takes 4 and a half hours for a jet to fly from coast to coast. One jet leaves Los Angeles for New York at 4:40 p.m. while another jet leaves New York for Los Angeles at 6:00 p.m. Which plane will be closer to New York when they pass each other?

Thanks :)

Answer 1

(1) The number of ways to arrange n things is n! = n * (n-1) * (n-2) * ... * 2 * 1. That's because there are n ways to choose the first position, then only n-1 items left to choose the second and so on. So, 4! = 24.

(2) I believe $1.19 consisting of 3 quarters (or a half dollar and a quarter) plus 4 dimes and 4 pennies.

(3) When they pass each other, they are at the same position, so neither is closer to NY.

Answer 2

24

99 cents

Obviously when they pass each other they will be the same distance from NY