There
are two types of problems asked based on coding-decoding. Those problems are
based on:
1. Letter Coding-decoding
2. Number Coding-decoding
1.
Letter Coding-decoding:
Basic information about the arrangements of
English letters is require to deal with such problems. Here I’m listing some of
the basics about the arrangements of alphabets in English language.
·
There are 26 alphabets in English out of
which 5(A,E,I,O,U) are called vowels and remaining 21 are called consonants.
·
Numbers assigned to these letters in forward
and reverse order are as follows:
|
A
|
B
|
C
|
D
|
E
|
F
|
G
|
H
|
I
|
J
|
K
|
L
|
M
|
N
|
O
|
P
|
Q
|
R
|
S
|
T
|
U
|
V
|
W
|
X
|
Y
|
Z
|
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
|
26
|
25
|
24
|
23
|
22
|
21
|
20
|
19
|
18
|
17
|
16
|
15
|
14
|
13
|
12
|
11
|
10
|
11
|
8
|
7
|
6
|
5
|
4
|
3
|
2
|
1
|
A-------------------Z
<<<<LEFT RIGHT>>>>
Example: CEMENT
is EGOGPV then FLOOR would be?
Explanation:
E+2=G
By the same logic F L O O R H N Q Q T
2.
Number Coding-decoding:
Most of the questions ask in this category is based on
the place value of the letter(mention in
above table).
Let us take an example to understand
Example: APPLE
is codded as 50 then what would be
the code for ORANGE
Explanation:
Place
value of letter A=1 (from the above table)
Place value of letter P=16
Place value of letter P=16
Place value of letter L=12
Place value of letter E=5
Sum=1+16+16+12+5=50
Similerly by adding the
place value of letters in ORANGE, we
get
15+18+1+14+7+5=60
