Question: why 7 and 11 in craps?
Answer: If 7 is rolled before the point you lose. The fundamental bet in craps is the Pass Line Bet, which is a bet for the shooter to win their point number. A Pass Line Bet is won immediately if the Come Out roll is a 7 or 11. If the Come Out roll is 2, 3 or 12, the bet loses (known as 'crapping out').