Another terminology alert: We call the notation (a,b) an ordered pair and (a,b,c) an ordered triple (and yes, we call (a,b,...,n) an ordered n-tuple). Generally, the first member of the pair (or triple, etc.) is from some set A, and the second member of the pair (or triple, etc.) is from some set B, etc. If A has m elements and B has k elements, how many ordered pairs can be formed from A and B? Is this related to any of the previous problems?