There are six digital cards below. How many cards can you draw to ensure that there are both odd and even numbers? (123456) There are six digital cards below. At least a few cards should be drawn to ensure that there are both odd and even numbers? (123456) 2. How many cards must be drawn from a deck of playing cards (54) to ensure that there must be a spade?

There are six digital cards below. How many cards can you draw to ensure that there are both odd and even numbers? (123456) There are six digital cards below. At least a few cards should be drawn to ensure that there are both odd and even numbers? (123456) 2. How many cards must be drawn from a deck of playing cards (54) to ensure that there must be a spade?

Because there are three odd numbers and three even numbers
So 3 + 1 = 4
54-2 = 52 draw two trumps
52 / 4 = 13, there are 4 kinds of colors, 13 of each
13 * 3 = 39 except for hearts and trumps, there are 39 other cards in total
39 + 2 = 41, except for hearts, there are 41
So if you draw 42 cards, there will definitely be one