Probability of Winning a Major Lottery Twice

For a single individual, the probability of winning a major lottery jackpot twice is astronomically low: roughly 1 in 24 quadrillion (24,000,000,000,000,000) for someone who buys one ticket per drawing for two different jackpots. However, when considering the millions of lottery players across the country, the probability that someone, somewhere wins twice is actually not as improbable as it seems.

There have been at least a dozen documented cases of people winning million-dollar-plus lottery prizes twice. Notable examples include a Virginia woman who won $1 million twice in the same month in 2020, a Massachusetts man who won $1 million twice in 18 months, and a Canadian couple who won major prizes twice within two years. Mathematically, this illustrates the difference between the probability of a specific person winning twice (virtually impossible) and the probability of any person out of millions of players winning twice (unlikely but expected given enough players and time).

This phenomenon is sometimes called the "Birthday Problem" analog for lotteries. With over 200 million American adults and half buying lottery tickets regularly, the expected number of repeat major winners over decades is actually greater than zero. Each ticket has the same odds regardless of previous wins: the lottery has no memory.