13.

What is the missing number 'X' of the series 7, X, 21, 31, 43?

UPSC - 2015

14.

Consider the following three-dimensional figure:

How many triangles does the above figure have?

UPSC - 2018

15.

Examine the following three figure in which the numbers follow a specific pattern:

The missing number (?) in the third figure above is

UPSC - 2013

16.

In a queue, Mr. X is fourteenth from the front and Mr. Y is seventeenth from the end, while Mr. Z is exactly in between Mr. X and Mr. Y. If Mr. X is ahead of Mr. Y and there are 48 persons in the queue, how many persons are there between Mr. X and Mr. Z?

UPSC - 2011

17.

Examine the following statements:

1. Rama scored more than Rani.

2. Rani scored less than Ratna.

3. Ratna scored more than Rama.

4. Padma scored more than Rama but less than Ratna.

Who scored the highest?

UPSC - 2012

18.

In five flats, one above the other, live five professionals. The professor has to go up to meet his IAS officer friend. The doctor is equally friendly to all, and has to go up as frequently as go down. The engineer has to go up to meet his MLA friend above whose flat lives the professor's friend. From the ground floor to the top floor in what order do the five professionals live?

UPSC - 2012

A.

Engineer, Professor, Doctor, IAS officer, MLA

B.

Professor, Engineer, Doctor, IAS officer, MLA

C.

IAS officer, Engineer, Doctor, professor, MLA

D.

Professor, Engineer, Doctor, MLA, IAS officer