If in a certain language NEOMAN is coded as OGRQFT, then ZKCLUP is the

If in a certain language NEOMAN is coded as OGRQFT, then ZKCLUP is the code of :

YJBKTO
YIZHPJ
YIAQKJ
YIZIRM
This question was previously asked in
UPSC CAPF – 2015
The correct answer is B. The code transforms the original word by adding a sequential number to the alphabetical position of each letter: +1 for the first letter, +2 for the second, and so on. To find the original word from the coded word ZKCLUP, we apply the reverse transformation: -1 for the first letter, -2 for the second, etc.
The pattern in the coding is adding 1, 2, 3, 4, 5, 6 to the alphabetical position of the letters in “NEOMAN” to get “OGRQFT”.
N(14) + 1 = O(15)
E(5) + 2 = G(7)
O(15) + 3 = R(18)
M(13) + 4 = Q(17)
A(1) + 5 = F(6)
N(14) + 6 = T(20)
To decode “ZKCLUP”, we subtract 1, 2, 3, 4, 5, 6 respectively:
Z(26) – 1 = Y(25)
K(11) – 2 = I(9)
C(3) – 3 = Z(26)
L(12) – 4 = H(8)
U(21) – 5 = P(16)
P(16) – 6 = J(10)
The decoded word is YIZHPJ.
This type of coding is a simple letter substitution cipher based on arithmetic progression applied to letter positions. Understanding the sequence and whether to encode or decode is crucial.
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