Three children are sharing a bike and a skateboard. How many different groups of 2 children can ride these toys at one time?

Hello NY,

So, this question is asking you for the number of different groups of children who can ride some toys at one time.

- How many total children are there? Just so we can follow along, let's call that number "N"

- How many children can ride the toys at one time? That is, how many toys are there? Let's call that "R"

The question is now, how many different groups of R children can be formed from a total of N children?

Depending on what level of math you're in, those groups of children have a special name. They're either permutations or combinations. If those words mean something to you, then the question is: which one are we talking about here?

If you're not at that level yet, and you have no idea what a combination or a permutation is, then this is a different question. :) How about picking names for the N children and seeing how many different ways you can pick R of them? There aren't too many, so you might be able to count them by hand...

Hope some of this helps,

-- Michael