Thread: probability-easy?

i have been working on this question for at least an hour and still couldnt get the answer.

Question:
Naomi a fan of alternative has 12CDs:
3 Nine Inch Nails
2 Sound Garden
2Monster magnet
1Pretty twisted
2Queensryche

If Naomi randomly loads her player with 5 CDs. What is the probability that will hold

a) Exactly 1 Sound Garden
b) 3 Nine Inch Nails or 3 Sound Garden

I did:
a) 2C1 TIMES 11C4
12C5 12C5

b)3c3 Plus 3C3
12C5 12C5

Thanks.

Originally Posted by questiongirl

i have been working on this question for at least an hour and still couldnt get the answer.

Question:
Naomi a fan of alternative has 12CDs:
3 Nine Inch Nails
2 Sound Garden
2Monster magnet
1Pretty twisted
2Queensryche

If Naomi randomly loads her player with 5 CDs. What is the probability that will hold

a) Exactly 1 Sound Garden
b) 3 Nine Inch Nails or 3 Sound Garden

I did:
a) 2C1 TIMES 11C4
12C5 12C5

b)3c3 Plus 3C3
12C5 12C5

Thanks.

You say there are 12 CD's but you have only listed 10 ....?