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.

The correct answer is H8 : E6 : B4.

To identify the group that does not follow the same pattern, let's analyze the relationship between the letter and its corresponding numerical position in the English alphabet, as well as the step pattern between the numbers in each option.

First, recall the positional values of the letters in the English alphabet:

A = 1, B = 2, C = 3, D = 4, E = 5, F = 6, G = 7, H = 8, I = 9, J = 10, K = 11, L = 12, M = 13, N = 14, O = 15, P = 16, Q = 17, R = 18, S = 19, T = 20, U = 21, V = 22, W = 23, X = 24, Y = 25, Z = 26.

Now, let's examine the pattern in each option step-by-step:

Option 1: M13 : J10 : G7

Letter positions: M = 13, J = 10, G = 7

Numerical pattern:

13 - 3 = 10

10 - 3 = 7

This group follows a pattern of subtracting 3 at each step.

Option 2: Z26 : W23 : T20

Letter positions: Z = 26, W = 23, T = 20

Numerical pattern:

26 - 3 = 23

23 - 3 = 20

This group also follows a pattern of subtracting 3 at each step.

Option 3: D4 : A1 : X24

Letter positions: D = 4, A = 1, X = 24 (counting backwards: D → A is -3; A wrapping back to X is -3 position-wise: 1 - 3 = -2 ≡ 24 mod 26)

Numerical pattern:

4 - 3 = 1

1 - 3 (wrapping around the 26-letter alphabet) = 24

This group also follows the pattern of subtracting 3 at each step.

Option 4: H8 : E6 : B4

Letter positions: H = 8, E = 5 (given as E6 in the option), B = 2 (given as B4 in the option)

Numerical pattern:

8 - 2 = 6

6 - 2 = 4

Here, the pattern subtracts 2 instead of 3, and the numbers do not match the standard alphabetical positions for E (5) and B (2).

Therefore, H8 : E6 : B4 is the group that does NOT follow the same pattern as the others.