For one roll of a certain die, the probability of rolling a two is 1/6. If this die is rolled 4 times, which of the following is the probability that the outcome will be a two at least 3 times?
a) (1/6)^4
b) 2(1/6)^3 +(1/6)^4
c) 3((1/6)^3)*(5/6)+(1/6)^4
d) 4((1/6)^3)*(5/6)+(1/6)^4
e) 6((1/6)^3)*(5/6)+(1/6)^4
D i want some easy way to do this question, because such type of questions will consume more than a minute to do in real gmat test
a) (1/6)^4
b) 2(1/6)^3 +(1/6)^4
c) 3((1/6)^3)*(5/6)+(1/6)^4
d) 4((1/6)^3)*(5/6)+(1/6)^4
e) 6((1/6)^3)*(5/6)+(1/6)^4
D i want some easy way to do this question, because such type of questions will consume more than a minute to do in real gmat test
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