17th April Gre Quants Question

1. The product of prime factors of 300.
A. 15
B. 30
C. 45
& so on....
Ans: B


2. If 'P' is the probability of an event occurring, P* is the probability of not occurring an event and if P>0.5, then
Col A: PP*
Col B: P
Ans: B


3. If (2,1) is the centre of the circle and (9,1) is the point on the circumference, then what is the radius of the circle?
Ans: 7


4. In a bottle of 3 red, 4 green and 5 blue marbles, if 2 marbles are taken out, what is the probability that two marbles are of red color?
Ans: 3c2/12c2 (or) 1/22


5. Given A = {6, 6, 9,10,14,15}
B = {7, 9,10,11,14, 15}
Col A: Standard deviation of A
Col B: Standard deviation in B
Ans: A


6. Given a series of numbers x, y, z, 0, 1, 1, 2, 3, 5, 8…….If every number in the series is sum of the proceeding two numbers, then what is value of x?
Ans: 2


7. Given that there are two boats X and Y which start at the same point. If boat X travels due north at a rate 3miles/hr and boat Y travels due east at a rate of 4miles/hr, then at what time will the two boats be 10 miles apart?
Ans: 2hrs