Permutations and Combinations Quiz Set 009

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Question 1

3 men are standing in front of 4 cabins. In how many ways can they enter the cabins?

 A

24.

 B

29.

 C

22.

 D

25.

Soln.
Ans: a

The first has 4 options, the second has (4 - 1), and so on. This is expressed as 4P3, which evaluates to 24.


Question 2

There are 3 trains between two stations A and B. In how many ways can a student go from A to B and return by a different train?

 A

6.

 B

11.

 C

4.

 D

7.

Soln.
Ans: a

The upward journey is possible in 3 ways, and the downward in 2 ways. So the outcomes are 3 × 2 = 6.


Question 3

There are 5 trains between two stations A and B. In how many ways can a student go from A to B and return by a different train?

 A

20.

 B

25.

 C

18.

 D

21.

Soln.
Ans: a

The upward journey is possible in 5 ways, and the downward in 4 ways. So the outcomes are 5 × 4 = 20.


Question 4

The letters of the word 'PICTURE' have to be arranged such that the vowels come together. How many different ways are possible?

 A

720.

 B

730.

 C

710.

 D

740.

Soln.
Ans: a

This word has 7 letters, out of which 4 are consonants and 3 are vowels. The vowels have to occupy three contiguous positions. This triad can be arranged in 3! ways like this: we can place 3 vowels in first place, 2 in second place and 1 in the third place, giving 3 × 2 × 1 = 6 permutations. Next, we have to arrange the 4 consonants and the triad treated as one letter, giving 5! = 120 possibilities. So the total possibilities are 6 × 120 = 720.


Question 5

Section A of an exam has 3 questions, B has 6 questions and C has 4 questions. In how many ways can a student attempt the paper if he has to select one question from each of these sections?

 A

72.

 B

77.

 C

70.

 D

73.

Soln.
Ans: a

Clearly, it is 3 × 6 × 4 = 72.


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This Blog Post/Article "Permutations and Combinations Quiz Set 009" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-05-17.

Posted by Parveen(Hoven),
Aptitude Trainer


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