Choosing Blocks | PuzzledQuant

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New on YouTube: This HRT Quant Interview Question Has a One-Line Answer - Watch now

Get quant-ready in 2026

⚡ Build the skills to land top-paying quant jobs. Offer ends in 25d 09h 48m 26s25 days 9 hours 48 minutes 26 seconds.

You have 11 distinct physical blocks. Nine of them are labelled 1 through 9, and the other two are both labelled 10 (they are different blocks that happen to carry the same label). In how many ways can you choose a set of 3 of the 11 blocks so that at least one of the chosen blocks has an even label?