Can you pass matric maths?

[Syco]

What happened to QED. (Quad erat demonstrandum)

 

[Mike Hoxbig]

The five cars can be parker in a 5 X 4 X 3 X 2 X 1 ways. The three silver cars can be parked in 3 X 2 X 1 ways. So there are (3X2X1)(5X4X3X2X1) = 720 ways to park the car.

Fail. There are 4 non-silver cars and 3 silver cars. The correct answer is actually 144...

 

[Bar0n]

Fail. There are 4 non-silver cars and 3 silver cars. The correct answer is actually 144...

I was going to say 7!/3! due to the group of 3 silver cars. I'm not sure that we can simply group the non-silver cars together?

 

[2026]

I was going to say 7!/3! due to the group of 3 silver cars. I'm not sure that we can simply group the non-silver cars together?

The question does not say to group the silver cars in any way... so...

 

[Bar0n]

The question does not say to group the silver cars in any way... so...

They're redundant arrangements. We do not distinguish between silver 1, silver 2, silver 3. (or do we??)

 

[Bar0n]

I got 75% but just randomly clicked away at the geometry ones.

 

[Mike Hoxbig]

They're redundant arrangements. We do not distinguish between silver 1, silver 2, silver 3. (or do we??)

Hard to say from the wording, but I assume we do, otherwise why mention it?

If we don't then the answer is simply 7!, and whoever set the question doesn't know what they're talking about...

 

[CruelBreeze]

After going through the questions and having completed matric recently i can say that that's grade 11 maths. Not matric.

 

[Bar0n]

Hard to say from the wording, but I assume we do, otherwise why mention it?

If we don't then the answer is simply 7!, and whoever set the question doesn't know what they're talking about...

My reasoning was that we have 7 cars, but 3 are redundant arrangements. I concede that I seem to have misunderstood the question.

 

[The_Ogre]

Pffft, you guys are so wrong.

The reason why the silver cars are there is because a silver car driving at 120km/h is faster than any other car driving at the same speed!

 

[hawker]

Easy stuff :/

 

[Ninja'd]

Pffft, you guys are so wrong.

The reason why the silver cars are there is because a silver car driving at 120km/h is faster than any other car driving at the same speed!

The f**k?

 

[Bar0n]

The f**k?

Well yeah. Quantum physics and all that jazz. Silver is more quantum.

 

[The_Ogre]

The f**k?

Well yeah. Quantum physics and all that jazz. Silver is more quantum.

Woa, you guys seem to have a blond moment lulz! Here's the proof from koeks

we are arguing about this concept, that if a car and a truck can both travel at 120km/h in the same direction, the car will be faster than the truck due to the fact the the car is lighter... and again due to the fact that the aerodynamics of the car are better than those of the truck. keep in mind that the speed is constant 120km/h...

we both agree that more power will be needed to make sure the truck is at 120km/h and less power will be needed to make sure the car is at 120km/h.

i say that the car will be faster due to the weight for one... he say the will be the same

please help...

 

[nakedpeanut]

Not sure why this is so difficult..


edit: it's all in the javascript

json: {"2":{"type":"single","id":2,"catId":0,"points":6,"correct":[0,0,0,1,0,0,0]},"4":{"type":"single","id":4,"catId":0,"points":4,"correct":[0,0,0,1,0,0,0]},"6":{"type":"single","id":6,"catId":0,"points":6,"correct":[0,1,0,0,0,0,0]},"8":{"type":"single","id":8,"catId":0,"points":5,"correct":[0,0,0,1,0,0,0]},"10":{"type":"single","id":10,"catId":0,"points":3,"correct":[0,0,0,0,1,0,0]},"12":{"type":"single","id":12,"catId":0,"points":7,"correct":[0,0,0,0,1,0,0]},"14":{"type":"single","id":14,"catId":0,"points":4,"correct":[0,0,0,1,0,0,0]},"16":{"type":"single","id":16,"catId":0,"points":2,"correct":[0,0,0,0,1,0,0]},"18":{"type":"single","id":18,"catId":0,"points":3,"correct":[0,1,0,0,0,0,0]},"20":{"type":"single","id":20,"catId":0,"points":4,"correct":[0,1,0,0,0,0,0]}} });

 

[battletoad]

Woa, you guys seem to have a blond moment lulz! Here's the proof from koeks

haha, that was a classic thread

I like that combinatorics are part of the syllabus right now, and that geometry has returned. However, I've heard the geometry paper is optional, is this true?

 

[onlinepaul]

Q.5 is bady worded . It says "how many different ways can ALL cars be parked." They even capitalised the "ALL" 7! = 5040, but it isn't one of the answers.