LINK as requestedOk, I get it there are 8 possible combinations. Looking at the chart. Thanks for helping me understand a bit more.

However, when I use an online calculator to calculate the permutations of 2 numbers, 3 at a time. Tells me N has to be bigger than R. I guess the calculator was not set up to calculate permutations of boolean numbers?

I know this is off topic, but I'm weird like that.