# Permutations, Combinations and Probability (IAS (Admin.) Prelims CSAT Paper-II (Aptitude)): Questions 1 - 4 of 9

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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 » Permutation

Appeared in Year: 2014

MCQ▾

### Question

A group of 630 children is seated in rows for a group photo session. Each row contains three less children than the row in front of it. Which one of the following number of rows is not possible?

### Choices

Choice (4) Response

a.

6

b.

3

c.

5

d.

4

## Question number: 3

» 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: 4

» Permutations, Combinations and Probability » Probability

Appeared in Year: 2017

MCQ▾

### Question

A bag contains 20 balls. 8 balls are green, 7 are white and 5 are red. What is the minimum number of balls that must be picked up from the bag blindfolded (without replacing any of it) to be assured of picking at least one ball of each colour?

### Choices

Choice (4) Response

a.

17

b.

13

c.

11

d.

16

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