Question

MEDAl FOR THE BEST ANSWER

A box contains twenty cards numbered 1 through 20. One card is to randomly drawn from the box.

What is the probability that the card drawn will show a multiple of 4, a multiple of 7, or a multiple of 9?

A. 9/20


B. 3/20


C. 1/20


D. 1/3

Answer 1

might have to contact an expert. that is hard

Answer 2

Well, from 1-20 there are
5 multiples of 4
2 Multiples of 7
and 2 of 9 sooo
Thats 9/20 if you add em all up

Answer 3

My suggestion is that you write out the "sample space" for each of the three events listed: that you come up with a multiple of 4, a multiple of 7 or a multiple of 9.

Look at the numbers within the set {1, 2, 3, ..... , 19, 20}. How many of those numbers are multiples of 4: I before counting them, I'd write out those multiples: {4, 8, 12, 16, 20}. There are 5 multiples of 4 in that set {1, 2, 3, .... , 19, 20}.

Now, list multiples of 7 in the same way.

Last, list multiples of 9 in the same way.

Since we can obtain "a multiple of 4," "a multiple of 7," or a multiple of 9, independently,

add up: {5/20, 2/20, 2/20).

Congrats to Puff the Magic Dragon for having obtained the correct answer first.

Answer 4

hahahahha but for sure the both of you gave the best answer, but I will give for the Dragon Flame because he was first!!!