Question

How many two-letter strings— the first letter from A and the second letter from B— Can be formed from the sets:

A= {b, c, d} and
B= {a, e, i, o, u}

Answer 1

There are 12 two-letter strings that can be formed: ba, be, bi, bo, bu, ca, ce, ci, co, cu, da, de, di, do, du.