Unfair Heads #1 | 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 50m 16s25 days 9 hours 50 minutes 16 seconds.

You have 5 coins. Four are fair and the fifth has two heads. You pick two of the five coins at random, toss them, and both land heads. What is the probability that one of the two coins you picked is the two-headed coin? Give an exact fraction.