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Re: What is the probability of rolling a number less than 3 at l [#permalink]
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I think you mean when you need to calculate the probability of the events you do NOT want.
so you use 1-the probability of the events that occur

In this case the question is a little bit more complicated.

However, the explanation provided above is the best way to deal with.

Ask if you do need further assistance for the question.

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Re: What is the probability of rolling a number less than 3 at l [#permalink]
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asmasattar00 wrote:
Carcass wrote:
What is the probability of rolling a number less than 3 at least 3 times in 5 rolls of a six-sided die?

A. 2/15

B. 17/81

C. 1/3

D. 2/5

E. 15/32


KUDOS for the right solution and explanation


@carcass can we solve this question using complement rule ??? if ues kindly show the solution in this way



Using the complement rule here won't be any faster.
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Re: What is the probability of rolling a number less than 3 at l [#permalink]
P(choosing it 3 times) = (2/6)^3 * (4/6)^2 * 5!/(3!2!) = 1280/7776
P(choosing it 4 times) = (2/6)^4 * (4/6)^1 * 5!/(4!1!) = 320/7776
P(choosing it 5 times) = (2/6)^5 = 32/7776

Total = (1280+320+32)/7776 = 1632/7776 = 17/81
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Re: What is the probability of rolling a number less than 3 at l [#permalink]
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