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It's not my fault this lot are so stubbornly wrong. I've given them any number of easy illustrations and not one has come up with an argument against the clear evidence that the switch strategy works in practice.

Some of you (the ones who have not yet seen the light) argue that the probability of the first choice box holding the prize changes as other boxes are eliminated. So the initial 1 in 20 chance becomes 1 in 16 when 4 boxes have been eliminated. That is wrong, although it would be correct if...

Let's try it another way. Take a game with four boxes, A, B, C and D: Box A holds £100 Box B holds £1 Box C empty Box D empty I don't know which box is which. I have to choose one box, which then remains unopened until the end of the game. Two of the remaining boxes are eliminated...

No - I disagree with that. If you remove 5 boxes to begin with, open them all and all are empty, then the chance of any one of the remaining 15 holding the top prize is 1 in 15. However, if you remove five boxes and open 4 (which are empty) but the fifth remains unopened, the chance of the...

Let's take the first selected box as A. There is a 1 in 20 chance it holds the prize. Conversely, there is a 19 in 20 chance that one of the other 19 boxes holds the prize. You would agree with that - no? Box A is now out of the draw (not subject to elimination). From the remaining 19...

It's a 50:50 chance if you make a random choice - toss a coin if you like. However, if you have played the game from the start and you KNOW which box was first selected, the probability of the other box being the 250k one is 19:1, as I have proved. There will be an alternative way of...

It seems too simple but the logic is inescapable. Show me any other starting choice by which a 'always swap' strategy would lose. (Obviously the 19:1 probability only come into play when all the 18 other 'losing' boxes have been eliminated. We're not asked to analyse the probability of that...

Too simple for you?

I have to congratulate Softus and a few others who have patiently tried to explain why their analysis of the Monty Hall and DOND problems are correct. I believe they are and I have been searching for the simple and succinct explanation that will convince the 50:50 sceptics. I think I've found...

That IS nonsense (childish babbling if you prefer). Or is it your idea of reasoned comment and criticism?

Two lighting ideas which I am particularly pleased with and thought I'd share and ask for others: 1) In the main bedroom, which has three 'runs' of built in wardrobe/cupboard: on top of each cupboard I have laid a length of rope light approx. the length of the cupboard, all linked and...

There's a lot of disparaging nonsense on this board about ELV downlighters. They may not be very efficient but they provide a clean, crisp light and an uncluttered look. For some purposes, they have unmatchable advantages. For example, I have a 'corridor' hallway ~4m long with no natural...

The reason for the additional core could be for a second switch live to a PIR to allow manual over-ride - i.e. permanent live to PIR terminal, switch live to over-ride terminal, neutral, earth (or two switch lives from separate switches).

Found this thread and tried the lenghth of string solution. It worked a treat to bypass the interlock. The plastic catch is broken so I need a replacement. Fantastic resource this forum. Many thanks to Snowflake99.

URGENT - PLEASE HELP IF POSSIBLE We have a Zannussi FJ1093 washing machine. It is quite old (8 years maybe) but we have kept it covered under a breakdown insurance policy. The door interlock mechanism has broken so we can't open the door at the end of a cycle. The handle feels 'wrong' as...

Eh? Really? Easier to terminate (say) 12 cores (3 cables + flex) in a 5A JB than terminate the same number in a 4-gang connector block and snap a chocbox over the join? However, I'm now a bit doubtful about how robust their patent protection is. Just been to an electrical wholesale and...

You may be right but I am more inclined to accept what he said at face value. Don't underestimate the general business ineptitude of many inventors and other people who have a good business idea but simply don't know how to bring it to market or how to run a business, or are simply too busy...

Tonight's programme saw the owner of the UK 'chocbox' rights asking for £150k for 10% of his business. I think he ended up giving 30-36%. I know nothing about non-UK markets but the UK market potential seems to me to be huge. In particular, the arrival of HIPs will (I imagine) increase need...

But the light should be fused down to less than 13A, no? And that's too low to be of practical utility for the downstream sockets. Perhaps need another FCU with a lower rating for the light? Or reverse the adjacent FCU/socket so the socket is a spur from the ring (allowed), use an...

The pros are being really helpful on this one, aren't they (not). As a humble and of course wholly inadequate DIYer, I'd suggest there is nothing wrong in doing as you suggest except it's a wee bit messy. A lightng circuit is usually a radial. Adding one 'spur' or branch is electrically safe...