Question

A first grade teacher uses ten flash cards, numbered 1 through 10, to teach her students to order numbers correctly. She typically asks students to choose four flash cards randomly, and then arrange them in ascending order. One day, she removes the cards numbered 2 and 4 from the deck of flash cards. On that day, how many correct arrangements of four randomly selected cards are possible? Timeline

Answer 1

Thank you for asking this question.

The options for this question are missing. Here are the missing options:

A. 70  

B. 210  

C. 336  

D. 840  

E. 1680

Answer:

The correct answer is option A : 70

8p4= 1680  

Number of ways to arrange four cards: 24  

1680/24= 70  

If there is any confusion leave a comment below.

Answer 2

Answer:

70

Step-by-step explanation:

Overall there should be 10 cards but 2 are removed now.

So 8 cards left out.

Now if we select any 4 cards from these 8, we can always arrange them in ascending order since all the cards are distinct.

Thus answer will be 8C4 = 70