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If letters are replaced by opposite letters (A=Z, B=Y), how is 'CAT' coded?

AXZG
BYAH
CWZF
DXAH
Answer & Solution
Correct answer: A. XZG
Opposite letters have positions summing to 27: C(3)->X(24), A(1)->Z(26), T(20)->G(7). Thus, CAT is coded as XZG.
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