Math (PS)
The probability that a visitor at the mall buys a pack of candy is 30%. If three visitors come to the mall today, what is the probability that exactly two will buy a pack of candy?
(A) 0.343
(B) 0.147
(C) 0.189
(D) 0.063
(E) 0.027
Correct Answer - C - (click and drag your mouse to see the answer)
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Verbal (SC)
Between 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture to 1950.
(A) Between 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture
(B) Between 1990 and 2000 the growth of the global economy was more than that during 10,000 years, from when agriculture began
(C) The growth of the global economy between 1990 and 2000 exceeds that which had been for 10,000 years from the beginning of agriculture
(D) The growth of the global economy between 1990 and 2000 exceeds what it has been for 10,000 years, from when agriculture began
(E) The growth of the global economy between 1990 and 2000 exceeded what it did for the 10,000 years from the beginning of agriculture
Correct Answer - A - (click and drag your mouse to see the answer)
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In this scenario , order does not matter.
So in this case:
If any of the two men buy candy then the third one should not buy any candy – AND condition here , hence
Probability is (.3) *( .3)*(1-.3)*3
where the last 3 is total no of possible combinations ,not in any particular order.
This equals
.3*.3*.7*3=.189