OpenStudy (anonymous):

Victoria selects a card at random from a box of blank greeting cards. The box has 5 "Happy Birthday" cards, 11 "Thank You" cards, and 4 "Get Well Soon" cards. What is the probability that she selects a "Thank You" or "Get Well Soon" card?

5 years ago
OpenStudy (shane_b):

First, how many cards are there in all?

5 years ago
OpenStudy (anonymous):

20

5 years ago
OpenStudy (shane_b):

Right...and since you're looking to see what her odds of picking a Thank You or Get Well Soon card...what's the total number of those cards?

5 years ago
OpenStudy (anonymous):

15

5 years ago
OpenStudy (shane_b):

So her odds of picking one of those cards are 15 out of 20...which can be reduced to 3 out of 4.

5 years ago
OpenStudy (anonymous):

so 75% am i right

5 years ago
OpenStudy (shane_b):

yep

5 years ago
OpenStudy (anonymous):

thank you

5 years ago
OpenStudy (shane_b):

yw

5 years ago
OpenStudy (anonymous):

:)

5 years ago