NDA 2016 Paper 2 | Probability Question 13 | Mathematics

A special dice with numbers 1, $$-$$1, 2, $$-$$2, 0 and 3 is thrown thrice. What is the probability that the sum of the numbers occurring on the upper face is zero ?

1/72

1/8

7/72

25/216

NDA 2016 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

There is 25% chance that it rains on any particular day. What is the probability that there is at least one rainy day within a period of 7 days?

$$1 - {\left( {{1 \over 4}} \right)^7}$$

$${\left( {{1 \over 4}} \right)^7}$$

$${\left( {{3 \over 4}} \right)^7}$$

$$1 - {\left( {{3 \over 4}} \right)^7}$$

NDA 2016 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

A salesman has a 70% chance to sell a product to any customer. The behaviour of successive customers is independent. If two customers A and B enter, what is the probability that the salesman will sell the product to customer A or B ?

0.98

0.91

0.70

0.49

NDA 2016 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

A student appears for tests I, II and III. The student is considered successful if he passes in tests I, II or I, III or all the three. The probabilities of the student passing in tests I, II and III are m, n and 1/2 respectively. If the probability of the student to be successful is 1/2, then which one of the following is correct?

m(1 + n) = 1

n(1 + m) = 1

m = 1

mn = 1

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