# Permutations, Combinations and Probability-Combination (IAS (Admin.) Prelims CSAT Paper-II (Aptitude)): Questions 1 - 4 of 4

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## Question number: 1

» Permutations, Combinations and Probability » Combination

Appeared in Year: 2014

MCQ▾

### Question

Six identical cards are placed on a table. Each card has number ’ 1’ marked on one side and number ‘2’ marked on its other side. All the six cards are placed in such a manner that the number ‘1’ is on the upper side. In one try, exactly four (neither more nor less) cards are turned upside down. In how many least number of tries can the cards be turned upside down such that all the six cards show number ‘2’ on the upper side?

### Choices

Choice (4) Response

a.

3

b.

This cannot be achieved

c.

5

d.

7

## Question number: 2

» Permutations, Combinations and Probability » Combination

Appeared in Year: 2014

MCQ▾

### Question

With reference to the figure given below, the number of different routes from S to T without retracing from U and/or V, is

### Choices

Choice (4) Response

a.

3

b.

6

c.

9

d.

18

## Question number: 3

» Permutations, Combinations and Probability » Combination

Appeared in Year: 2015

MCQ▾

### Question

A selection is to be made for one post of Principal and two posts of Vice-Principal. Amongst the six candidates called for the interview, only two are eligible for the post of Principal while they all are eligible for the post of Vice-Principal. The number of possible combinations of selectees is

### Choices

Choice (4) Response

a.

4

b.

12

c.

18

d.

None of the above

## Question number: 4

» Permutations, Combinations and Probability » Combination

Appeared in Year: 2015

MCQ▾

### Question

A student has to opt for 2 subjects out of 5 subjects for a course, namely, Commerce, Economics, Statistics, Mathematics I and Mathematics II. Mathematics II can be offered only if Mathematics I is also opted. The number of different combinations of two subjects which can be opted is

### Choices

Choice (4) Response

a.

5

b.

6

c.

7

d.

8

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