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i got E, my reasoningakpareek wrote:There are 8 marbles in a jar. 5 are red and 3 are green. If 4 marbles are selected at random from jar, what is the probability that at least one red marble and one green marble will be seleted?
A) 4/5 B) 10/11 C) 11/12 D) 12/13 E) 13/14
Yes, you are absolutely correct. Same reasoning.clock60 wrote: i got E, my reasoning
the total number of ways to select 4 marbles out of 8 =8C4=5*7*2=70
now we have several options
3-red,1-green
2-red, 2-green
1-red, 3 green
i did not find otners
5C3*3C1+5C2*3C2+5C1*3C3=30+30+5=65
the desired result=65/70=13/14
