There are six possible choices for A. Whatever is chosen for A, there are four different choices for B (no duplicated numbers). If you just imagine writing down all the combinations, you could write them in an array with six rows and four columns. The total number of possibilities is:My teacher told me to find how many combinations here. Is there another way other than writing all the possibilities?
Let A=(0,1,2,3,4,5) and B=(6,7,8,9)
How many distinct pairs are in A x B?