accidentality actuarial calculation adventitiousness blind bargain break casualness chance chance at odds destiny fate flukiness fortuitousness fortuity fortune gamble gambling chance good fortune good luck hap happenstance happy chance heedless hap how they fall indeterminacy indeterminateness law of averages lot luck matter of chance moira opportunity potluck potshot principle of indeterminacy probability problematicness random sample random shot risk run of luck serendipity sporting chance statistical probability the breaks theory of probability toss toss-up touch and go uncertainty uncertainty principle whatever comes