# Number Test

The "Number Test" is a type of assessment commonly found in aptitude or assessment tests. It evaluates an individual's numerical reasoning and mathematical problem-solving abilities. In this test, candidates are presented with a variety of questions related to numbers, patterns, sequences, arithmetic, and logical reasoning.

The main objective of a number test is to assess how well a person can comprehend, analyze, and manipulate numerical data. It often involves solving problems related to number series, number patterns, mathematical operations, numerical analogies, and more.

In this type of questions, a long series of numbers is given. The candidate is required to find out how many times a number satisfying the conditions, specified in the question, occurs.

Example:      How many even numbers are there in the following sequence of numbers which are immediately followed by an odd number as well as immediately preceded by an even number?

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

1. One
2. Three
3. Five
4. Six
5. None of these

Answer:       Numbers divisible by 2 are called even while those not divisible by 2 are called odd numbers.

Thus, the numbers satisfying the given conditions can be shown as follows:

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

Clearly, there are four such numbers; hence, the answer is (e).

Example:      In the series,

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

How many pairs of successive numbers have a difference of 2 each?

1. 4
2. 5
3. 6
4. 7

Answer:       Clearly, the pairs of successive numbers having a difference of 2 can be shown as follows:

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

Thus, there are six such pairs.  Hence, the answer is (c).