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
A: 70
B: 210
C: 336
D: 840
E: (E) 1,680
举一反三
- 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
- 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]
- If 3 playing cards were randomly selected from a set of playing cards<br/>(A<br/>pack of playing cards removed two kings is 52 cards in total),<br/>the probability of leopard will be lower than that of flushstraight
- There are between 100 and 110 cards in a collection of cards. If they are counted out 3 at a tie, there are 2 left over, but if they are counted out 4 at a time, there is 1 left over. How many cards are in the collection ？（） A: 101 B: 103 C: 106 D: 107 E: 109
- On Valentine’s Day, people must send romantic cards to their lovers. The cards are usually decorated with the following pictures except _________.