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English 11 Public

G2-S1-数学广角-搭配（一）排列与组合

Study Slideshow

从3、7、9这三个数中选取2个求差（大数减小数），得数有（）种可能，分别是（）。Choose 2 of the three numbers 3, 7 and 9 to find the difference (the larger number minus the smaller number), there are ( ) possibilities for the number obtained, which are ( ).

3 4、2、6

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用（）、（）、（）这3个数，可以组成45、48、54、58、84和85这6个两位数。With the 3 numbers ( ), ( ) and ( ), you can form 6 two-digit numbers 45, 48, 54, 58, 84 and 85.

4 5 8

15

小明和小刚玩“石头剪刀布”游戏，他们一共有（）种出法。Xiaoming and Xiaogang play the game of "rock-paper-scissors", they have a total of ( ) ways to play. ①3 ②6 ③9

③

15

Choose 2 out of the following 3 postcards and give 1 each to your grandfather and uncle who are hobby collectors. There are a total of ( ) ways to give them.

6

15

Mom has selected the following 4 scarves at the store, but she only has enough money with her to buy any of the 2 of them. Mom has a total of ( ) choices.

6

15