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Question:

In a certain code language, 'DUCK' is written as 'FSEI' and ‘FISH’ is written as ‘HGUF’. How will 'FROG' be written in that language?

Explanation:

D + 2 = F
U - 2 = S
C + 2 = E
K - 2 = I

Similarly
F + 2 = H
I - 2 = G
S + 2 = U
H - 2 = F

Hence,
F + 2 = H
R - 2 = P
O + 2 = Q
G - 2 = E

FROG = HPQE

Hence, option (d).