Explanation
Step 1: Assign positions to the letters
The word is PRISON.
-
P = 16
-
R = 18
-
I = 9
-
S = 19
-
O = 15
-
N = 14
Step 2: Check Forward Direction
-
P (16): Count forward: 17(R), 18(I), 19(S). (P and S) is a pair because there are 2 letters between them in the word and in the alphabet.
-
R (18): Count forward: 19(I), 20(S)... No match.
-
I (9): Count forward: 10(S), 11(O), 12(N). No match.
-
S (19): Count forward: 20(O), 21(N). No match.
-
O (15): Count forward: 16(N). No match.
Step 3: Check Backward Direction
-
N (14): Count backward: 15(O). (N and O) is a pair (14, 15).
-
N (14): Count backward further: 16(S), 17(I), 18(R). (N and R) is a pair because there are 3 letters between them (N,O,S,I,R).
-
O (15): Count backward: 16(S), 17(I), 18(R). (O and R) is a pair because there are 2 letters between them (O,S,I,R).
-
S (19): Count backward: 20, 21, 22. No match.
-
I (9): Count backward: 10, 11. No match.
Step 4: List the identified pairs
-
P - S (Forward)
-
N - O (Backward)
-
N - R (Backward)
-
O - R (Backward)
There are a total of 4 such pairs.
Correct Option: (c)
