Challenge #140: Prove the Birthday Paradox!

[TylerNa]

I hit 75% at 36 and 90% at 42.

Spoiler

WorkflowMacro

[MichalM]

Went the iterative macro route first but when I saw it took almost a minute for 1k iterations per group I decided to take the direct route

2.1s for 1k iterations (75% at 33 and 90% at 40)

8.6s for 10k iterations (75% at 32 and 90% at 41)

[JoeM]

Some of you may have been able to recognize this problem type, some of you may have not! For those who arrived on an answer - you've just made a Monte Carlo simulation!

Not so hard, right?

[Laurap1228]

not sure I did this correctly

[Niklas]

Bit late to the (birthday) party. My solution-trying to avoid using a macro and accounting for gap years:

Spoiler

[Ladarthure]

My solution

[Hakimipous]

For someone being born a 29th February, thanks for this ;D

[NikolajFrosig]

Spoiler

[wenjuanchen]

Solution attached. I built a batch macro upon an iterative macro. It is fun!

Spoiler

Spoiler

Spoiler

Spoiler