Consider a bowl containing 36 different slips of paper. Ten of the slips of paper each contain one of the digits from the set of 0 through 9 and 26 slips each contain one of the 26 letters of the alphabet. If one slip is drawn at random, what is P(odd number and a vowel)?

Think about it. If a piece of paper either has a number or a letter, how can you have both in one draw?