# Permutations, Combinations and Probability-Combination (IAS Prelims CSAT Paper-II (Aptitude)): Questions 1 - 2 of 2

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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

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