In each of the following questions, a group of three numbers/symbols is given in each option. Identify the group that does NOT follow the same pattern as the others.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. O15 : Q17 : S21.
1. M13 : O15 : Q17 → M + 2 = O, O + 2 = Q, 13 + 2 = 15, 15 + 2 = 17
2. N14 : P16 : R18 → N + 2 = P, P + 2 = R, 14 + 2 = 16, 16 + 2 = 18
3. L12 : N14 : P16 → L + 2 = N, N + 2 = P, 12 + 2 = 14, 14 + 2 = 16
4. O15 : Q17 : S21 → O + 2 = Q, Q + 2 = S, 15 + 2 = 17, 17 + 2 = 19 ≠ 21
Thus, "O15 : Q17 : S21" is the odd one out.