mystical_goat
Offline
Posts: 1425
|
|
« on: Friday, January 18, 2019, 17:09:21 » |
|
You build a pyramid of cubes with 1 cube on the top layer, 4 together on the 2nd, 9 on the 3rd, etc. There are 1 cubes in a 1 layer pyramid, 5 in a 2 layer, 14 in a 3 layer etc. How many cubes in an n layer pyramid?
|
|
|
Logged
|
|
|
|
Ardiles
Offline
Posts: 11528
Stirlingshire Reds
|
|
« Reply #1 on: Friday, January 18, 2019, 17:13:21 » |
|
I'll have a go at this later. Love this stuff. I know someone else will get there first though.
|
|
|
Logged
|
|
|
|
Gwah
Offline
Posts: 128
|
|
« Reply #2 on: Friday, January 18, 2019, 17:19:47 » |
|
I made it (2n^3 + 3n^2 + n)/6
I may be wrong.
(Sorry Ardiles)
|
|
|
Logged
|
Do you often sing or whistle just for fun?
|
|
|
Reg Smeeton
Walking Encyclopaedia
Offline
Posts: 34913
|
|
« Reply #3 on: Friday, January 18, 2019, 17:23:05 » |
|
Is it to do with Pascal's triangle and pyramid?
|
|
|
Logged
|
|
|
|
Combe Up
|
|
« Reply #4 on: Friday, January 18, 2019, 17:30:41 » |
|
Is the triangle anything to do with Oxford United's ground?
|
|
|
Logged
|
|
|
|
4D
Or not 4D that is the question
Offline
Posts: 21915
I can't bear it 🙄
|
|
« Reply #5 on: Friday, January 18, 2019, 18:09:10 » |
|
Thames Valley triangle?
|
|
|
Logged
|
|
|
|
Reg Smeeton
Walking Encyclopaedia
Offline
Posts: 34913
|
|
« Reply #6 on: Friday, January 18, 2019, 18:27:40 » |
|
Thames Valley triangle?
Is that like the Winnersh Triangle which is something that's always puzzled me.
|
|
|
Logged
|
|
|
|
Lemis
Offline
Posts: 299
|
|
« Reply #7 on: Friday, January 18, 2019, 18:35:32 » |
|
I made it (2n^3 + 3n^2 + n)/6
I may be wrong.
(Sorry Ardiles)
You're correct
|
|
|
Logged
|
Have you seen the writing on the wall?
|
|
|
Samdy Gray
Dirty sneaky traitor weasel
Offline
Posts: 27137
|
|
« Reply #8 on: Friday, January 18, 2019, 19:02:16 » |
|
Well Googled.
|
|
|
Logged
|
|
|
|
mystical_goat
Offline
Posts: 1425
|
|
« Reply #9 on: Friday, January 18, 2019, 19:32:12 » |
|
I made it (2n^3 + 3n^2 + n)/6
I may be wrong.
(Sorry Ardiles)
Amazing! That's way beyond my capabilities. Thank you.
|
|
|
Logged
|
|
|
|
suttonred
Offline
Posts: 12510
|
|
« Reply #10 on: Friday, January 18, 2019, 19:55:04 » |
|
What the holy hell are you lot talking about? Tits, music, football, films, and tits should be the topics.. I think the word bra prompted at least 2 of those.
|
|
|
Logged
|
|
|
|
Ardiles
Offline
Posts: 11528
Stirlingshire Reds
|
|
« Reply #11 on: Friday, January 18, 2019, 20:01:40 » |
|
Promise I haven't looked at the posts above before posting. I get: (2n 3+3n 2+n)/6
|
|
|
Logged
|
|
|
|
Ardiles
Offline
Posts: 11528
Stirlingshire Reds
|
|
« Reply #12 on: Friday, January 18, 2019, 20:02:49 » |
|
I made it (2n^3 + 3n^2 + n)/6
I may be wrong.
(Sorry Ardiles)
Good work!!
|
|
|
Logged
|
|
|
|
suttonred
Offline
Posts: 12510
|
|
« Reply #13 on: Friday, January 18, 2019, 21:19:37 » |
|
Is that like the Winnersh Triangle which is something that's always puzzled me.
Should be called winnersh dead zone. I got off a national express for a wee there on the way back from a game in London when I lived in Reading. The coach driver decided he could do with one less drunken passenger and left me there. Took me ages to get home. Nothing there of human interest.
|
|
|
Logged
|
|
|
|
Reg Smeeton
Walking Encyclopaedia
Offline
Posts: 34913
|
|
« Reply #14 on: Friday, January 18, 2019, 21:30:32 » |
|
Should be called winnersh dead zone. I got off a national express for a wee there on the way back from a game in London when I lived in Reading. The coach driver decided he could do with one less drunken passenger and left me there. Took me ages to get home. Nothing there of human interest.
So a bit like the Bermuida Triangle for human interest....
|
|
|
Logged
|
|
|
|
|