Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

- Index
- » Help Me !
- »
**Sequencing**

Pages: **1**

**Mariner****Member**- Registered: 2010-06-16
- Posts: 35

Hi, I was wondering if I could get your help on some particular number sequence questions and the tricks behind them.

Here are a few.

10, ?, 41, 17, 52, 09

15, ?, 70, 18, 52, 00

Thanks,

Offline

**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,155

Hi Mariner,

I looked at these yesterday and hoped someone else would pick up your problem. But alas, no one has.

The trouble is: there's no obvious pattern so no wonder you are stuck. If you write down any five numbers at random, it is possible to fit a formula to them but that's not what you want I suspect.

These go up and down so that counts out 'plus x', 'subtract x' , 'multiply by x' and 'divide by x'. So I thought maybe there are two interlocked sequences, but I haven't got enough numbers for that, so I have to admit defeat at the moment. Sorry

But this post will refresh the thread with New Post so maybe someone else will spot something.

Bob

*Last edited by bob bundy (2010-12-20 00:01:22)*

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

Why are the last numbers written **09** and **00** rather than 9 and 0? Is that supposed to be a clue?

*Last edited by JaneFairfax (2010-12-21 07:42:03)*

Offline

**stapel****Member**- Registered: 2006-07-22
- Posts: 15

Mariner wrote:

Hi, I was wondering if I could get your help on some particular number sequence questions and the tricks behind them.

Here are a few.

10, ?, 41, 17, 52, 09

15, ?, 70, 18, 52, 00

Try breaking up the numbers into sets of three digits. Remove the commas and try to find a pattern in:

. . . . .10_, _41, 175, 209

. . . . .15_, _70, 185, 200

There is no real "trick" to this. I just happened to think of it and it just happened to work.

Offline

**soroban****Member**- Registered: 2007-03-09
- Posts: 452

.

. .

.

*Last edited by soroban (2010-12-22 11:51:16)*

Offline

**Monox D. I-Fly****Member**- Registered: 2015-12-02
- Posts: 894

soroban wrote:

.

Because it contains "math"?

I knew it.

*Last edited by Monox D. I-Fly (2017-11-07 18:52:04)*

Offline

Pages: **1**

- Index
- » Help Me !
- »
**Sequencing**