Reasoning - Alpha Numeric Sequence


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Alphanumeric sequence is an important chapter in reasoning and the questions on this subject are asked in almost all the competitive exams. Alphanumeric sequence is a sequence which consists of both alphabets and numbers. In this sequence, we can also add some symbols along with alphabets and numbers.

For example we can make an alphanumeric sequence as follows −

A $ E R 9 * T 5 F 6 @ D 8

In the above sequence, we can see that there are numbers, alphabets, and symbols. These types of sequences are called alphanumeric sequence. We can make many sequences like this and can deduce questions based on the sequences.

Important Points to Remember

Let’s have an alphanumeric sequence −

A $ E R 9 * T 5 F 6 @ D 8

Questions regarding this chapter can come in this way −

a. Which element is nth from the left of the sequence?

b. Which element is nth from the right of the sequence?

c. Which element is mth to the right of nth from the left of the sequence?

d. Which element is mth to the left of nth from the left of the sequence?

e. Which element is mth to the right of nth from the right of the sequence?

f. Which element is mth to the left of nth from the right of the sequence?

g. A precedes B

h. B is preceded by A

i. B follows A

j. A is followed by B

To solve questions like this, we have to watch the sequence thoroughly and answer accordingly.

a. Which element is nth from the left of the sequence?

To get the answer of the above question, we have to look at the sequence from the left side and have to count the exact number that is asked in the question.

b. Which element is nth from the right of the sequence?

To get the answer of the above question, we have to look at the sequence from the right side and have to count the exact number that is asked in the question.

c. Which element is mth to the right of nth from the left of the sequence?

To get the answer for such type of questions, we have to find out the nth element from the left side of the sequence and then find out the mth element to the right of that particular element.

d. Which element is mth to the left of nth from the left of the sequence?

To get the answer for such type of questions, we have to find out the nth element from the left side of the sequence and then find out the mth element to the left of that particular element.

e. Which element is mth to the right of nth from the right of the sequence?

To get the answer for such type of questions, we have to find out the nth element from the right side of the sequence and then find out the mth element to the right of that particular element.

f. Which element is mth to the left of nth from the right of the sequence?

To get the answer for such type of questions, we have to find out the nth element from the right side of the sequence and then find out the mth element to the left of that particular element.

g. If it is written that A precedes B then it means A is placed before B.

h. Similarly if it is written that B is preceded by A then it means A is placed before B.

i. If it is written that B follows A then it means B is placed after A.

j. If it is written that A is followed by B then B is placed after A.

These ten type of questions are normally asked in this chapter. Whether it is of a type or b type or c type or j type we have to read the question carefully and see the sequence and finally we can get the answer according to the question.

A F % 5 G H & 8 Y 6 3 N M * ! H 8

1 - Which element is 3rd to the right of 5th from left?

Options

A - &

B - 8

C - 6

D - 3

Answer − Option B

Explanation

By observing the sequence, we can get that 8 is the required element at the required place, hence, option b is correct.

2 - How many numbers are there which are immediately preceded by a symbol and followed by a consonant?

Options

A - One

B - Two

C - Three

D - None

Answer − Option B

Explanation

Only two are possible and they are: % 5 G and & 8 Y.

3 - Which element is 4th to the left of 5th from right?

Options

A - 8

B - 6

C - 3

D - Y

Answer − Option D

Explanation

Y is the required element. Hence option D.



reasoning_alpha_numeric_sequence.htm
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