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YT21 is related to TO19 in a certain way based on the English alphabetical order. In the same way, PL17 is related to KG15. To which of the following is KF13 related, following the same logic? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 тАУ Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
FO11
AE11
FT17
FA11
FA11
Apply reverse alphabetical position for the first letter and -2 for the second letter; keep the number same.
Apply reverse alphabetical position for the first letter and -2 for the second letter; keep the number same.
Analyze YT21 to TO19
Y (25) becomes T (20), a shift of -5. T (20) becomes O (15), a shift of -5. Number 21 becomes 19, a shift of -2.
Analyze PL17 to KG15
P (16) becomes K (11), a shift of -5. L (12) becomes G (7), a shift of -5. Number 17 becomes 15, a shift of -2.
Apply to KF13
K (11) - 5 = F (6). F (6) - 5 = A (1). Number 13 - 2 = 11. Result: FA11.
A: FO11 is incorrect because the second letter should be A, not O. B: AE11 is incorrect because the first letter should be F, not A. C: FT17 is incorrect because it uses the wrong number and letter shift.
D is correct because the logic follows a uniform -5 shift for both letters and -2 for the number: K-5=F, F-5=A, 13-2=11, resulting in FA11.
Always verify the shift for every single character and the number independently; often in such series, letters follow a uniform shift while the number follows a different one.
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