Number Test

Concept 1:

Series of Numbers model

To have a knowledge about the numbers like followed by, preceded by, immediately followed by and also immediately preceded by etc. 

Eg: How many 4’s are there preceded by 7 but not followed by 3 in the following number series?

5 9 3 2 1 7 4 2 6 9 7 4 6 1 3 2 8 7 4 1 3 8 3 2 5 6 7 4 3 9 5 8 2 0 1 8 7 4 6 3

Concept 2:

Set of Numbers model

May ask any kind of questions like after interchanging the digits or adding / subtracting some thing to any of the digits to the given numbers etc.

Eg: The digits of each of the following five numbers are written in reverse order and five new numbers are formed.

513       726       492       865       149

Which of the following will be the middle digit of the third number from the top when the new numbers are arranged in descending order?

Concept 3:

Number of Pairs model

Basically, in this model he will give you a number and will asked to find the number of such pairs after arranging the given number in ascending or descending order.

Eg: How many such pairs of digits are there in the number 8314629 each of which as many digits between them in the number as after arranging the digits in descending order? 

Concept 4:

Based on Conditions model

In this concept, the problems will be given in two rows. The results of those two rows will get based on certain conditions mentioned in the problem.

Eg: Directions: In each of the following questions, two rows of numbers are given. The resultant number in each row is to be worked out separately based on the following rules and the questions below the rows of numbers are to be answered. The operations of numbers progress from left to right.

Rules:

I. If an odd number is followed by a two-digit even number then they are to be added.

II. If an odd number is followed by a two-digit odd number then second number is to be subtracted from the first number.

III. If an even number is followed by a number which is a perfect square of a number, then the second number is to be divided by the first number.

IV. If an even number is followed by a two-digit even number then the first number is to be multiplied by the second number.

13        11        4

17        13        12

If the resultant of the first set of numbers is multiplied by the resultant of the second set of numbers, what will be the outcome?

Alpha-Numeric Sequence puzzle:

In this concept we have only one model of problem. . This concept talks about all letters, numbers and also various symbols. 

To have a knowledge about the words like followed by, preceded by etc. Also, in this model of problems every problem is different in each group.

Eg: Directions: Study the following arrangement carefully and answer the question given below.

            R  E  5  D  A  P  $  3  T  I  Q  7  9  B  #  2  K  %  U  1  M  W  4  *  J  8  N

1. Which of the following is exactly in the middle between 3 and 1 in the above arrangement?  

a) B                  b) K                  c) 9                   d) #                   e) None of these

2. How many such numbers are there in the above arrangement, each of which is immediately preceded by a consonant and not immediately followed by a consonant?  

a) None             b) One              c) Two              d) Three            e) None of these

3. How many such vowels are there in the above arrangement, each of which is immediately followed by a number but not immediately preceded by a consonant?  

a) None             b) One              c) Two              d) Three            e) Four

4. Which of the following is seventh to the left of the sixteenth from the left in the above arrangement?  

a) A                  b) U                  c) 4                   d) T                  e) None of these

5. Four of the following five are alike in a certain way based on their position in the above arrangement and so form a group. Which is the one that does not belong to that group?  

a) B K 7            b) M * U           c) D P E            d) W J 1            e) 3 Q P

Which is the fourth number to the right of the number which is exactly in the middle of the following sequence of numbers?

9 8 7 6 5 4 3 2 1 8 6 4 2 1 3 5 7 1 2 3 4 5 6 7 8 9 4 3 2

A) 9                B) 7                 C) 5                 D) 2                 E) 1

SOLUTION:

Given number sequence is,

9 8 7 6 5 4 3 2 1 8 6 4 2 1 3 5 7 1 2 3 4 5 6 7 8 9 4 3 2

There are 29 numbers in the given sequence.

So, middle number = 15^th number = 3

From the given sequence it is clear that the fourth number to the right of this 3 is 2.

ANSWER: D

Study the following arrangement of numbers, symbols and letters carefully, follow the instructions and answer the questions given below.

D µ S 4 € 7 Y * T N 2 8 & C # K 9 P ! X $  π 6 H α Q 3 % 1 Z

Q1. What is the element which is 8th to the right of element which 7th to the left of C?

A) K                B) &                C) #                 D) 9                 E) N

SOLUTION:

The given series is,

D µ S 4 € 7 Y * T N 2 8 & C # K 9 P ! X $  π 6 H α Q 3 % 1 Z

8th to the right of the 7th element from left end is 15th element from left end that is #. 

ANSWER: C

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