Return of the Thursday Puzzle - Crisp Selection
Hmmm. Just as I got all formal with the Puzzle thing, with certificates and everything, the puzzle side of my brain shut down. Never mind, I think I'll make this a more informal, freewheeling, type of thing from now on. Maybe there will be a puzzle on Thursday, maybe not. Maybe even a different day. I think that you folks can probably handle the excitement.
Anyhoo, for today the puzzle is as follows:
Every day I take a bag of crisps to work. Four out of the five days I can have my favourite, barbecue flavour. But the fifth day I have to have something else (there are only four bags in the pack we buy each week). I need a way to decide for each day whether I am allowed to have bbq or not. Now, being me I'd write a C# program and use the Random class. It would have scanned pictures of the bags and sound effects and everything. But this time we are not me. We are another me who still likes the crisps and can only decide whether or not to have them by tossing a coin.
How?
(oh, and I have a couple of certificates to send out from last year - they will be arriving soon people)
(and yes, I do know it is Wednesday)