Drawing an Ace From a Card Deck in Intacto

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What is the chance to draw an ace in a randomly shuffled card deck of 52? There is one chance in a million for a plane to crash and for it to crash, leaving you the only survivor out of how many — 237 passengers? One chance in 237 million. Later in this convoluted thriller, a Russian Roulette variant appears, where 5 of 6 chambers contain bullets.