Can you solve this brain teaser?

I have a bowl containing 100 loose strings. We randomly pick two ends from the bowl and tie them together, continuing until there are no ends left to tie. What are the expected number loops when we finish?

P.S. let me know in the comments if you'd like me to post more brain teasers / probability questions like this. I have a huge stack of them from old quant trading interviews!

Submitted October 27, 2020 at 11:39AM by jzox
via https://ift.tt/31Ow2FZ

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