Worked Example
In the matrices given below â€˜Aâ€™ can be represented by 02, 13, 23, 34 and 42.
Similarly, â€˜Pâ€™ can be represented by 55, 66, 75, 88 and 97. Thus, we can identify the set of numbers for each letter in the given word.
Similarly, â€˜Pâ€™ can be represented by 55, 66, 75, 88 and 97. Thus, we can identify the set of numbers for each letter in the given word.
Matrix I


Matrix II



0

1

2

3

4



5

6

7

8

9

0

D

K

A

E

C


5

P

L

O

T

N

1

C

D

K

A

E


6

T

P

N

L

O

2

K

C

E

A

D


7

P

N

T

O

L

3

K

C

D

E

A


8

O

N

T

P

L

4

E

D

A

K

C


9

L

O

P

N

T

Select the appropriate choice which represents the code of the word COLD.
 44, 96, 95, 92
 31, 99, 77, 22
 30, 66, 86, 43
 10, 85, 79, 24
Analysis:
From Matrix I â€˜Câ€™ can be coded as 04, 10, 21, 31 or 44.
From Matrix II â€˜Oâ€™ can be coded as 57, 69, 78, 85 or 96.
From Matrix II â€˜Lâ€™ can be coded as 56, 68, 79, 89 or 95.
From Matrix I â€˜Dâ€™ can be coded as 00, 11, 24, 32 or 41.
Clearly choice (4) contains all correct codes.
Answer: (4)