state gov AP Police SI (Pre+Mains) Mock Test 2022 Logical Reasoning Coding Decoding Coding and Decoding By Letter Shifting
Comprehension Passage
In a certain code, the nth letter (n ≠ 15) of the English alphabet is coded as rth letter of it, where r is the remainder when 5n + 3 is divided by 26. (For instance, the 7th letter G is coded as L since 5.7 + 3 = 38 leaves remainder 12 when divided by 26 and L is the twelfth letter). If n = 15, take r = 26. The inverse process is used to decoding. Based on this, answer the question.
The code of the first alphabet is its immediate next letter among the given options, then the pair of such letters is
1
E, N
2
T, D
3
N, U
4
H, I