Coding and Decoding

In the code, the middle three letters are put in the reverse order.

The groups of second & third letters & fourth & fifth letters in the word interchange places in the code.

Each letter of the word is three steps behind the corresponding letter of the code.

Each letter of the word is three steps behind the corresponding letter of the code.

In the code, the letters of the word are put in the reverse order in position.

Each letter of the word is two steps behind the corresponding letters of the code.

In the code, the second and third letters of the word are interchanged, then fourth and fifth, and then sixth and seventh.

The letters are coded as +1, +2, +3 and so on.

Each letter of the word is one step behind the corresponding letter of the code.

In the code, the first letter is one place, the second letter is two places, the third letter is three places and so on before the corresponding letter in the word.

In the code, the letters at odd places are one letter ahead and those at even places are one letter before the corresponding letter in the word.

Each letter in the code is two alphabets ahead of the corresponding letter in the word.
So, the code for CHILDREN should be EJKNFTGP.
This is not available in the given options.
Hence, answer option 5 is correct. 

In the word, the first, third and fifth letters are moved two steps forward while second and fourth letters are moved one step backward to get the code.

Each letter of the word is four steps behind the corresponding letter of the code.

In the code, the first four letters are reverse in arrangement and then last four letters are reverse in arrangement.

Each letter of the given word is moved one step ahead to obtain the subsequent letter of its code.

In the code keeping first & last letters same, the second and second last, the third and third last letters & so on are interchanged.

The letters preceding the first, third and fifth letters of the given word and those succeeding the second, fourth and last letters of the word in the alphabet form the code.

The letters of the given word are written in the reverse order in the code.

If CHAMPION is coded as HCMAIPNO
Then NEGATIVE is coded as ENAGITEN
The letters are reversed.

In the code, the first three letters are kept as it is, the fourth letter is replaced with sixth, fifth is replaced with fourth and sixth is replaced fifth, and then the last two letters are interchanged.

Each letter in the code represents a letter that figures four places earlier in the English alphabet. (G for C, E for A)

In the given code, the first letter is the second alphabet, the second letter is the third alphabet, the third letter is the fourth alphabet and so on after the corresponding letter in the word.

In the code, the letters of the word are put in the reverse order in position.

In the code, we have alternately taken a letter one step behind and the other one step ahead of the corresponding letter in the word.
V(-1)U
K(+1)L
U(-1)T
L(+1)M
G(-1)F
M(+1)N
C(-1)B