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anonymous
 4 years ago
A student wants to buy 3 cds, but assume 5 cds feature the piano, 6 cds feature the trumpet, and 3 cds feature the saxaphone.
I figured there are 364 ways for 3 cd's to be selected.
In how many ways can the selection be made if cds featuring at least 2 different instruments are selected?_______________
anonymous
 4 years ago
A student wants to buy 3 cds, but assume 5 cds feature the piano, 6 cds feature the trumpet, and 3 cds feature the saxaphone. I figured there are 364 ways for 3 cd's to be selected. In how many ways can the selection be made if cds featuring at least 2 different instruments are selected?_______________

This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Moving on to computing probabilities by using equally likely outcomes after this

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i can copy and paste them

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0if you cant see the first part of your solution

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1I'll try again. Patience is a good thing. :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0you dont have to I am considering moving on to some other stuff that i am not sure how to do at all

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1I want to do it. You can move on to another problem while I work on this.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Your call man i have spent A LOT of time on these 27 questions our exam questions are coming directly from these Homework problems like this

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I will post another shortly im sure

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1Here's where I messed up. The problem is at least 2 different instruments are selected? I calculated at least 2 of the SAME instrument.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i need to sign off for a moment bu i will be back in 510 mins at the most

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1Okay, no rush. I just cleaned up my work area for my next take on this problem.

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1P = Piano, S = Sax, T = Trumpet Of the 3 cds we are buying, 2 could be of the same instrument and 1 of another instrument. I see the following cases: PPT, PTT and PPS, PSS, and TTS, TSS. Do you see others before we calculate?

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1PPT, PTT PPT==> C(5,2) times C(6,1) = 60 PTT ==> C(5,1) times C(6,2) = 75 Subtotal 1: 135 (Not Finished)

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1PPS, PSS PPS ==>C (5,2) times C (3,1) = 30 PSS ==> C(5,1) times C(3,2) = 15 Subtotal 2: 45 (Not Finished)

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1TTS, TSS TTS==> C(6,2) times C(3,1) = 45 TSS ==> C(6,1) times C(3,2) = 18 Subtotal 3: 63 (Not Finished)

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1Answer: Total of Subtotals of cases: 135 + 45 + 63 = 243 ways.

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1CW, what about this answer of 243?

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1What did we miss? By the way, is 314 the answer? I don't think so but tried something different.

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1We missed the case where all three are different such as P T S

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1PTS C(5,1) times C(6,1) times C(3,1) = 90

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1So, the corrected answer is the Answer: Total of Subtotals (exactly 2 different cases plus all 3 differnt: : 135 + 45 + 63 + 90 =333. Answer:333

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1The answer  333. Right or wrong.

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1Sure it's right? There may be another case out there, and we'll find it.

Directrix
 4 years ago
Best ResponseYou've already chosen the best response.1Okay, where are the other problems? "I will post another shortly im sure" you said.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0yea i will in a moment

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0they are a different section
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