Directions (Q.1-4): Study the following information carefully to answer following information carefully to answer the questions.
Five boys and five girls are sitting in a row. Find the probability that
1.All the girls are sitting together.
(e)None of the above
2.All the boys are sitting together.
(e)None of the above
3.All the girls are not sitting together.
(e)None of the above
4.All the boys are not sitting together.
(e)None of the above
5.An elevator starts with 5 passengers and stops at 8 different floors of the house. Find out the probability of the all the 5 passengers alighting at different floors.
(a)101/512
(b)105/512
(c)107/512
(d)109/512
(e)None of the above
6.If a 4-digit number is formed at random using the digits 1, 3, 5, 7 and 9 without repetition, then the probability that it is divisible by 5, is
(e)None of the above
Direction (Q.7-8): Study the information carefully to answer the questions that follow.
A basket contains 3 blue, 2 green and 5 red balls.
7.If three balls picked at random, what is the probability that at least one is red?
(e)None of the above
8. If four balls are picked at random, what is the probability that two are green and two are blue?
(e) None of the above
9. Two persons A and B appear in an interview for two vacancies. If the probabilities of their selections are 1/4 and 1/6, respectively, then the probability that none of them is selected, is
(e)None of the above
10. The probabilities of solving a problem by three students. A, B and C are 1/2,1/3 and 1/4, respectively. The probability that the problem will be solved, is
(e)None of the above
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