Stock Price Coin Flip | 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 51m 13s25 days 9 hours 51 minutes 13 seconds.

A stock is currently worth 50 dollars. Each day a fair coin is flipped: heads raises the price by 1 dollar, tails lowers it by 1 dollar. What is the probability that after 10 days the stock is worth exactly 50 dollars? Give the exact value.