ALPHA NUMERIC SERIES
Alphanumeric
(sometimes shortened to alphameric) is a combination of alphabetic
and numeric characters. In some cases,
it may include upper and lower case letters, punctuation marks, and
symbols (such
as @, &, and *,).
This
type of reasoning is a mixed bag of coding-decoding, series-based
reasoning and finding positions based reasoning questions.
Points
to note
Before
jumping to the questions, let us understand the meaning of few key
words that are generally used in such questions like "following,
followed by, preceding, and preceded by".
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Let us take two successive alphabets Y and Z. Here, Y is preceding Z and Z is preceded by Y. Also, Z is following Y and Y is followed by Z.
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Now, take three successive alphabets X, Y and Z. Here X and Y are preceding Z, but Y is immediately preceding Z whereas, X is not immediately preceding Z. Similarly, Y and Z are following X, but Y is immediately following X whereas, Z is not immediately following X.
Alphanumeric
Series: Solved Examples
DIRECTIONS
(Example no. 1-5): Study
the following digit-letter-symbol sequence carefully and answer the
questions given below:
4
P + S r 9 B # A 3 ? 7 c > Z % 6 d & Q @ 1
Example
1: If
the above sequence is written in the reverse order, then which
element will be 5th to the right of 16th element from the right
end?
Solution: Reversed
Sequence - 1 @ Q & d 6 % Z > c 7 ? 3 A # B 9 r S + P 4.
Hence,
now the 16th element
from the right end is % and 5th to
the right of % is ?
Example
2: How
many such numbers are there in the above sequence, each of which is
immediately preceded by a consonant and immediately followed by a
symbol?
Solution: Check
for the sequence Consonant-number-symbol. There is only 1
such case in
the above sequence: A
3 ?
Example
3: Which
element is seventh to the left of sixteenth element from the left in
the above sequence?
Solution: The
sixteenth element from the left is %. Now, we move 7th to the
left of %, which is A. Hence, A is
be the answer.
Example
4: If
the first half of the series is written in reverse order, then which
element will be fourteenth from the right end?
Solution: There
are a total of 22 characters in the above sequence. Since, the first
half of the above sequence is reversed, therefore, the sequence is:
?
3 A # B 9 r S + P 4 7 c > Z % 6 d & Q @ 1
So,
the required 14th character
from right is +
Example
5: Which
element will be fourteenth from the right end, if second half of the
series is reversed?
Solution: There
are total 22 characters given in the above sequence. As only the
second half is reversed the sequence becomes:
4
P + S r 9 B # A 3 ? 1 @ Q & d 6 % Z > c 7
So,
the required 14th character from right is A.
Alphanumeric
Series: Key Learning
-
One of the most scoring question-type in any competitive exam is alphanumeric series puzzles. These questions are high scoring as they can be solved very quickly.
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Learning shortcuts to handle these types of questions will significantly boost your reasoning score. Hence, try to practice as many questions as you can.
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