CODING DECODING REASONING NOTES FOR BANK & SSC CGL EXAM
In
bank exam (SBI, IBPS and RRB) and in SSC Reasoning is one of the most important
sections. A good score in reasoning test can lead you at higher marks in
banking exam. In reasoning coding decoding is important topic. Usually 3-4
questions can be given from this topic in bank exam or other competitive exams
as well. Here we are providing important tips and reasoning shortcut tricks on
coding – decoding topic which is asked in SBI, IBPS bank exams and other
competitive exams.
WHY
WE NEED CODING DECODING:
For
secure system we have need code system because in coding decoding system transmitting
a message between the sender and the receiver in the form of signals without a
third person knowing original message. In other words we can say that a code is
a ‘system of signals’.
Letter coding: In this coding alphabets of
words are replaced by some other letters according to some specific rule. You
have to find out which rule is applied to solve the question.
Example 1. In a code language if SCHOOL is written as CSOHLO, then how WINDOW will be coded in the same language?
a)
NDIWDN
b)
WNIDWO
c)
IWDNWO
d)
NIWWOD
e)
None of these
SOLUTION:
in this case the first alphabet is replaced by second alphabet and third
alphabet is replaced by fourth alphabet and so on. According to this rule
WINDOW will be written as IWDNWO.
So
answer will be (C).
Example 2. In a code language if MICROSOFT is written as NJDSPTPGU then how PRACTICE will be coded in the same language?
a)
QBDSUFJS
b)
QSBDUJDF
c)
QBUDBJFD
d)
BUDJQFDJ
e)
None of these
SOLUTION: in this coding type each
alphabet is replaced by next alphabet. According to this rule PRACTICE will be
written as QSBDUJDF.
So
answer is (B).
Number coding: In this coding numbers can be
assigned to words. Each word has unique numbers or each number have unique
alphabet.
Example 3. In a code language if NAME is written as 3486, GROWN is written as 51973. How is GEAR written in the code language?
a)
9511
b)
4897
c)
5641
d)
6541
e)
None of these
SOLUTION: In this case a number is
assigned to each alphabet. By the conclusion of two words you can find out code
of third word.
G
|
R
|
O
|
W
|
N
|
A
|
M
|
E
|
5
|
1
|
9
|
7
|
3
|
4
|
8
|
6
|
By
using this rule GEAR will be written as 5641.
So
answer is (C).
Mixed number/letter coding: In this type of coding some messages are coded into specific code language and the code for particular word is asked. In this two or more than two same words coded into same code. So you have to find out particular code for each word.
Example 4. If ‘edr qwe zxc’ means ‘tea is hot’; ‘qwe mnb klh’ means ‘weather is good’ and ‘zxc dsw mee’ means ‘please take tea’, which word in that language means ‘hot’?
a)
Zxc
b)
Mee
c)
Qwe
d)
Edr
e)
None of these
SOLUTION: In the first and second
statement ‘is’ is common and in the code statement qwe is common. So ‘qwe’
means ‘is’. In the third and first statement ‘tea’ is common and in code
language ‘zxc’ is common. So ‘zxc’ means ‘tea’. By this method in the first
message only ‘hot’ word is remaining and also in code language ‘edr’ is
remaining. So ‘edr’ means ‘hot’.
Answer
is (D).
Symbols and places of digits: This type of coding recently added in the reasoning section. In this case either word can be coded into symbols or symbols can be coded into words.
Symbols and places of digits: This type of coding recently added in the reasoning section. In this case either word can be coded into symbols or symbols can be coded into words.
Example 5. In a certain code BROWN is written as &@#$% and MEAN is written as *^!%. How ROBE is written in that code?
a)
@#&^
b)
&^%$
c)
@#$%
d)
&^%#
e)
None of these
SOLUTION:
Each alphabet is coded into particular symbol.
B
|
R
|
O
|
W
|
N
|
M
|
E
|
A
|
&
|
@
|
#
|
$
|
%
|
*
|
^
|
!
|
According
to this rule ROBE will be written as @#&^.
Answer
is (A).
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