MBA Exam Numerical Ability Probability

Find the probability that a rectangle selected at random from a 10X10 chess board is a square.

1) 17/55
2) 7/55
3) 17/108
4) 7/108

Read Solution (Total 1)

No. of Squares= n(n+1)(2n+1)/6 = 385 ( Given n=10)
No. of rectangles= 11C2 * 11C2 = 3025 ( where 11 , 11 are no of horizantal and Vertical lines respectively)
Req. Probability = 385/3025=7/55...So ANSWER IS 7/55
9 years agoHelpfull: Yes(1) No(0)

MBA Other Question

ABC is a triangle with sides AB = 4, BC = 5, and CA = 6. D and E are the foot of the altitudes from the vertices A and B to the respective opposite sides. What is the values of the ratio CD/CE?

1) 2/3
2) 3/4
3) 4/5
4) 6/5
manoj,the gaurd stationed in the last compartment of a train,owned one pigeon.one day,while train was in motion,he wanted to send a message to the motorman ramesh sitting in the drivers seat.the train is 100 meters long and running at a speed of 60km/hr.the pigeon delivered the message to ramesh and returned to manoj.during this time the train had travelled 100 meters.what is the distance travelled by the pigeon(in meters) during the entire journey??what is the speed of the pigeon in m/s ?

1) 100(1+ rt2), 40
2) 100,20
3) 100(3+rt2),144
4) 100rt2,72