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Three boys are ages 4, 6 and 7 respectively. Three girls are [#permalink]
09 Dec 2012, 09:05
This post was BOOKMARKED
68% (02:54) correct
32% (01:39) wrong based on 63 sessions
Three boys are ages 4, 6 and 7 respectively. Three girls are ages 5, 8 and 9, respectively. If two of the boys and two of the girls are randomly selected and the sum of the selected children's ages is z, what is the difference between the probability that z is even and the probability that z is odd?
Re: Three boys are ages 4, 6 and 7 respectively. Three girls are [#permalink]
09 Jul 2014, 06:00
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