Sign up to access problem solutions.

Already have an account? Log in here.

If a coin is flipped twenty times, how many ways are there to get exactly ten tails and ten heads?

At a party, everyone shook hands with everybody else exactly once. There were 66 handshakes. How many people were at the party?

**Details and Assumptions**:

- You can't shake your own hand.

Sign up to access problem solutions.

Already have an account? Log in here.

Robbie is sitting for 9 subject papers in the GCSE O level examinations. In order to pass the examination, the number of subjects that he gets a pass grade in must be more than the number of subjects that he gets a fail grade.

The number of ways in which Robbie can pass his GCSE O level examinations is:

Sign up to access problem solutions.

Already have an account? Log in here.

I was on vacation in England, and wanted to visit the Tower of London. The roads were laid out on a grid map, and the castle was 4 blocks north and 5 blocks east. If I were to travel only north and east, how many routes did I have to get to the castle?

Sign up to access problem solutions.

Already have an account? Log in here.

I was on vacation in England, and wanted to visit the Tower of London. The roads were laid out on a grid map, and and the castle was 4 blocks north and 5 blocks east. Unfortunately, there was some police activity near the hotel, and that intersection was blocked off so I could not go through it.

If I were to travel only north and east, how many routes did I have to get to the castle?

Sign up to access problem solutions.

Already have an account? Log in here.

Sign up to access problem solutions.

Already have an account? Log in here.

×

Problem Loading...

Note Loading...

Set Loading...