How many cards do you need to take out from a pack of poker to be sure.
问题描述：
How many cards do you need to take out from a pack of poker to be sure.
How many cards do you need to take out from a pack of poker to be sure you have 2 of the same color?
答
从一副扑克牌中抽取多少张牌才能保证你有两张相同花色的牌?用英文怎么回答？5张牌啊，因为扑克牌由四个花色，抽5张必然有两张相同花色的，如果抽得少，就可能有2张相同的，也可能没有2张相同的，那就不能是“to be sure”了那就回答： Five.