Q2 EventsYou are playing a solitaire game in which you are dealt three cards without replacement from a simplified deck of 10 cards (marked 1 through 10). You win if one of your cards is a 10 or if all of your cards are odd.How many winning hands are there if different orders are different hands?[img=675x503]18034cff75e276b.png[/img]
举一反三
- A first-grade teacher use ten flash cards, numbered 1 through 10, to teach her students to order numbers correctly. She has students choose four flash cards randomly, then arrange the cards in ascending order. One day, she removes the cards numbered "2" and "4" from the deck of flash cards. On that day, how many different correct arrangements of four randomly selected cards are possible A: 70 B: 210 C: 336 D: 840 E: (E) 1,680
- Jerome wrote each of the integers 1 through 20, inclusive, on a separate index card. He placed the cards in a box, then drew cards one at a time randomly from the box, without returning the cards he had already drawn to the box. In order to ensure that the sum of all the cards he drew was even, how many cards did Jerome have to draw A: 19 B: 12 C: 11 D: 10 E: (E) 3
- I want you to___ ____(排列） all of your credit cards in a line.
- In exchanging name cards, which one is not usually correct? ( ) A: You’d better make the card facing the guest. B: You should always use both hands to show your respect. C: You should have a look at the card carefully before you put it into your pocket.
- When exchanging cards, you smile and walk to the other person and extend your name cards with both hands.