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1. ## Thread: Counting Challenge Problems

by thepillow
Replies
7
Views
1,518

### haha:). here's that q5 explanation: We are...

haha:).

here's that q5 explanation:

We are choosing a pair of 2 papers from the 4 papers, and repeating this over and over until we have selected all of the possible pairs of 2. Because it...

by thepillow
Replies
3
Views
6,285

### That's the million dollar question! Well, I...

That's the million dollar question!

Well, I think the first step should always be to "translate" the question into more intuitive and colloquial language. This might seem trivial, but unless it is...

by thepillow
Replies
3
Views
6,285

### 1. On any given roll the odds of getting a number...

1. On any given roll the odds of getting a number greater than 4 is 2/6 = 1/3. (Only 5 and 6 are greater than 4, so this is 2 out of the 6 numbers.)

This means that the probability of getting a...
4. ## Thread: Maths problems !

by thepillow
Replies
2
Views
3,063

### hey Rain, 1. Useful fact: a right triangle...

hey Rain,

1. Useful fact: a right triangle maximizes the area. So if you know 2 sides of a triangle, then you can figure out the maximum possible area by treating the triangle as a right triangle....
5. ## Thread: Counting Challenge Problems

by thepillow
Replies
7
Views
1,518

### Hey Kamakshi, I'm glad you like my posts!...

Hey Kamakshi,

6. ## Thread: Counting Challenge Problems

by thepillow
Replies
7
Views
1,518

### Counting Challenge Problems

Ok, here are 5 counting problems that definitely require a bit of careful consideration. Definitely feel free to post your responses even if you doubt they're correct. No one is getting graded here...
7. ## Thread: Math Challenge Questions - Round II

by thepillow
Replies
23
Views
3,808

Thanks for your nice words. I'm happy to do whatever you think will help everyone the most.

You said that you have some questions already. If you want, send me them in a PM and I'll...
8. ## Thread: Math Challenge Questions - Round II

by thepillow
Replies
23
Views
3,808

### Thanks. I didn't exactly understand what he was...

Thanks. I didn't exactly understand what he was referring to before, but yes it can definitely be computed like this. Hadn't even thought of it.
9. ## Thread: Math Challenge Questions - Round II

by thepillow
Replies
23
Views
3,808

### Oh I see what you mean. I misunderstood what you...

Oh I see what you mean. I misunderstood what you where saying in your earlier post.
10. ## Thread: Math Challenge Questions - Round II

by thepillow
Replies
23
Views
3,808

### Hey Fahad, Consider the numbers: 1, 2, 128,...

Consider the numbers: 1, 2, 128, 378 (i just picked these randomly)

The average of these 4 numbers is 127.25. Of the 4 numbers, 1 and 2 are below the mean, 128 and 378 are above the...
11. ## Thread: Math Challenge Questions

by thepillow
Replies
22
Views
6,285

### Great question.Here are a few general guidelines:...

Great question.Here are a few general guidelines:

If we say that a set of numbers has mean µ and standard deviation σ (you can use any symbols, these are just conventions), then:

1. If some...
12. ## Thread: Math Challenge Questions

by thepillow
Replies
22
Views
6,285

### Hey Fahad, For this question here are my 2...

For this question here are my 2 preferred methods for solving it:

Method 1: The probability of picking Eva is 1/5. Then there are 4 names left and so the probability of picking...
13. ## Thread: A five-digit number is formed using digits 1, 3, 5, 7 and 9 .......

by thepillow
Replies
6
Views
31,216

### Hey Fahad, the reason I multiply by 24 is because...

Hey Fahad, the reason I multiply by 24 is because this is the number of times that each of our 5 numbers will appear in the units place, the tens place, hundreds place, etc.

Maybe this will make...
14. ## Thread: Math Challenge Questions - Round II

by thepillow
Replies
23
Views
3,808

### I might not have explained it clearly, but after...

I might not have explained it clearly, but after round 50 we still are flipping cards, it's just that it works out to be only 1 card each time. Every nth card would be every card corresponding to a...
15. ## Thread: Math Challenge Questions - Round II

by thepillow
Replies
23
Views
3,808

### There are 100 cards on a table. Each of the cards...

There are 100 cards on a table. Each of the cards is blue on one side and red on the other side. At first, all the cards are positioned so that the blue side is facing up.

Next, you perform these...
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