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1. If four balls are picked at random, what is the probability that two of them are green and two are blue?

3/5

1/2

1/18

1/70

11/12

2. In how many different ways can the letters of the word INDIGO be arranged?

1680

360

2520

840

1260

3. 8 men can complete a piece of work in 12 days. 4 women can complete the same piece of work in 48 days and 10 children can complete that piece of work inn 24 days. In how many days can 10 men, 4 women and 10 children together complete the work?

12 days

15 days

6 days

8 days

None of these

4. If the digits of a two-digit number are interchanged, the number so obtained is greater than the original number by 27. If the sum of the two digits of the number is 11, what is the original number?

47

38

74

83

5. A boat takes 8 hours to cover a distance while travelling upstream. Whereas while travelling downstream, it takes 6 hours. If the speed of the stream is 4 kmph, what is the speed of the boat in still water?

16 kmph

18 kmph

28 kmph

Cannot be determined