Coding and Decoding-Test 9

Each letter in the given message is moved two steps backward to obtain the corresponding letter of the code.

The first, second, third, fourth, …….. letters of the word are moved one, two, three, four, ……. steps backward respectively to obtain the corresponding letters of the code.

The first letter of the word is replaced by a set of two letters – one following it and the other  preceding it – in the code. The remaining letters of the word are each moved one step backward to obtain the remaining letters of the code, in order.

The first and third letters are each moved one step backward, while the second and fourth letters are each moved one step of forward to obtain the corresponding letters of the code. Finally, in the code so obtained, the last letter of the word is inserted at the end.

The word is first written twice and the letters at the even positions in the word so obtained, form the code.

The first, second, third and fourth letters of the word are moved two, four, six and eight letters forward respectively to obtain the code.

The letters of the word are written in a reverse order to obtain the code.

All the letters of the word, except the last letter, are written in a reverse order to obtain the code.

The first letter of the word is moved to the last position and ‘S’ is placed at the beginning, to form the code.

The letters in the first half and second half of the word are written in the reverse order to obtain the code.

The letters in the first half and second half of the word are written in the reverse order to obtain the code. Thus, we have :

MYSORE → MYS/ORE → SYM/ERO → SYMERO

The code is formed by first writing the last three letters of the word in a reverse order, followed by the first three letters in the same order. So, the code for STUPID should be DIPSTU.

The word is divided into groups of two letters each and then the letters of each group are written in a reverse order.

The second and third letters, fourth and fifth letters, sixth and seventh letters of the word mutually interchange positions to form the code.

The word is divided into groups of three letters each and then the letters in each group are written in a reverse order.

The last letter of the word remains unaltered in the code. The first six letters of the word are divided into two groups of three letters each and then, in each group, the last two letters are written in a reverse order.

The word is divided into groups of four letters each and then the letters in each group are written in a reverse order.

The first four letters, middle two letters and the last four letters of the word are written in a reverse order to form the code.

The code contains the letters of the word in the order – third, fourth, second, fifth, first and sixth.

Let us label the letters of the given word from 1 to 9. Then, the code contains the letters of the word in the order 6, 4, 7 ,3 5, 2, 8, 1, 9. Thus, we have :

M  A  U  S  O  L  E  U  M       →    L  S  E  U  O  A  U  M  M

1   2   3  4  5  6  7   8  9              6  4  7  3  5   2  8   1  9

The middle letter remains unaltered in the code. Let us label the five letters before the middle letter as well as those after it, from 1 to 5. Then, the code contains the letters of each group in the order 5, 4, 1, 3, 2.

Thus, we have :

E  S  T  A  B  L  I  S  H  E  D   →    B  A  E  T  S  L  D  E  I  H  S

1  2  3  4  5      1  2  3  4  5          5  4  1  3  2      5  4  1  3  2

The letters of the word are written in a reverse order and ten each letter is moved one step forward to obtain the code.

Each letter of the word except the first and last letters, is moved one step forward and then the order of the letters so obtained, is reversed to get the code.

The letters of the word are written in a reverse order and then each letter is moved one step backward to obtain the code.

Each letter in the word is moved one step forward and the first letter of the group so obtained is placed at the end, to obtain the code.