MBA Exam

A bag contains 1 Red, 2 Blue, 3 Green and 4 Yellow balls. Three balls are drawn from the bag randomly, one at a time, and the ball replaced into the bag every time. What is the probability that the three balls drawn are of different colours?

1) 3/10
2) 3/20
3) 1/2
4) 1/5
5) 1/10

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MBA Other Question

Three cities are connected such that each city has atleast one direct route to each of other.If one wants to go from A to B,either a direct route (AB) or an indirect route (ACB) can be used.Totally,there are 33 routes from A to B and 23 routes from B to C.How many indirect routes are there from A to C?

1) 18
2) 15
3) 16
4) 21
In how many ways 3 letters can be selected from 3 identical A's, 3 identical B's, and 3 identical C's ?

1) 10
2) 24
3) 64
4) 9