Ten tennis balls have numbers written on them so that one ball

nino11ru в категроии Математика, вопрос открыт 06.04.2017 в 22:25

is numbered “1”, two balls arenumbered“2”, three balls are numbered “3”,
* Задача предложена преподавателями департамента математики Бард-колледжа (Нью-Йорк, США)
and four balls are numbered “4”. The balls are placed in a bag and three
balls are drawn at random and without replacement. What is the
probability that the sum of the numbers on the balls drawn is divisible by
5? Варианты ответов: (A)1/16 ; (B)3/40 ; (C)1/6 ; (D)5/24 ; (E)1/4