Why is 13 showing up twice important? Number of house can be any.

Why there can be only one older than other two, if you say "eldest?"

So, I still don't have a clue for your

## Search found 57 matches

- Yesterday, 2:41 am
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

- June 25th, 2017, 10:38 pm
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

36= 2*3*6 I haven't checked the solution. So only thing I know is that: A>1 A <= B and B<100 ? A and B are integers. I don't really have any restrictions here. I've no idea how much is a+b or a*b, nor is there a limit of their sum/product. Doesn't this mean I can just pick any number for their value...

- June 25th, 2017, 10:38 pm
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

36= 2*3*6 I haven't checked the solution. So only thing I know is that: A>1 A <= B and B<100 ? A and B are integers. I don't really have any restrictions here. I've no idea how much is a+b or a*b, nor is there a limit of their sum/product. Doesn't this mean I can just pick any number for their value...

- June 25th, 2017, 6:04 pm
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

Actually, scratch all that. I wrote on paper that a+b<=100 xD

- June 25th, 2017, 5:45 pm
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

The only thing I can think of is that A and B can have range:

A = [2, 49]

B = [49, 97]

depending on the other number

EDIT:

My bad. B can also range from [2,97] if A=2

A = [2, 49]

B = [49, 97]

depending on the other number

EDIT:

My bad. B can also range from [2,97] if A=2

- June 21st, 2017, 9:07 am
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

The nominators (and denominators) are behaving almost as an integer sequence. But they are getting a step behind with each step the number gets bigger. Between 2,4,6... the nominators of ratios are 2,3,4. A more interesting things are denominators in ratios. Check them out. Starting from number 2 th...

- June 20th, 2017, 12:25 am
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

Norbert had spoken: "even for very simple programming tasks I often look up things." So is it advisable to learn programming that way? I'm having trouble just to write a function for sorting and inversing simple number lists. In python, where syntax couldn't be possibly easier :!: Sure th...

- June 17th, 2017, 5:17 pm
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

@Zaknafein Are we still talking mathematical way? Program should be easy. There is a hint: I can be dumb sometimes... :cry: Is it: 2n*(n+1)/2 => n(n+1) ? Also, if I multiply entire sequence by 2, I think the my nth N should then be reduced for half its size, and that can be a problem if its odd numb...

- June 16th, 2017, 12:30 pm
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

Ratios between sums of even and odd numbers, their progression and difference towards the given number are interesting...

- June 16th, 2017, 10:00 am
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

N(N+1) /2 would be math way. I remembered this after i wrote a small code which iterated through each number and adding it to the final sum. Then I figured this out and thought how math can sometimes be helpful (otherwise its a useless piece of crap :) ). Now Im trying to figure out a way to sum all...

- June 15th, 2017, 1:54 am
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

Not related to topic, but just for fun, let's check out who thinks as a programmer and who as a mathematician. Write a simple code that sums the all previous numbers (and that number). For example sum(10) would be 1+2+3+...+10.

- June 14th, 2017, 8:42 pm
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

You forgot 13 and 11, or Ive formulated the question in a wrong way. However I think that is correct. Anything above 169 must be divisible by yet another number.

More questions? xD

More questions? xD

- June 14th, 2017, 1:20 am
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

How many numbers exist between 1 and 1.000.000 that are divisible by either 11 or 13, and no other number (except 1, and themself, of course)?

- May 28th, 2017, 2:08 pm
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

(Say, is this your homework or something?) No. I've finished my last homework a long time ago :cry: , however, I'm still interested in relearning a few things that I've missed in math class because I was young and uninterested back than, or the things that I haven't fully understood. So now I just ...

- May 28th, 2017, 12:51 am
- Forum: Off-Topic
- Topic: Math problems
- Replies:
**33** - Views:
**273**

### Re: Math problems

Difficult to explain, so I've made these pics in attachment. One is integration problem. Given the function values, how would you determine the function, and how would you calculate the grey surface area using calculus. (I know it's an obvious circle, but I need calculus method). Second pic represen...