Identifying the Pattern Deviation

The question asks to find the pair in the sequence Q2, R4, S6, T8, V12 that does not follow the established pattern.

Analyzing the Sequence

Let's examine the sequence pair by pair:

• Q2
• R4
• S6
• T8
• V12

Letter Progression Analysis

The letters in the sequence are Q, R, S, T, V. Let's look at their alphabetical order and the steps between them:

• Q (17th letter) to R (18th letter): Step is $+1$ ($18 - 17 = 1$)
• R (18th letter) to S (19th letter): Step is $+1$ ($19 - 18 = 1$)
• S (19th letter) to T (20th letter): Step is $+1$ ($20 - 19 = 1$)
• T (20th letter) to V (22nd letter): Step is $+2$ ($22 - 20 = 2$)

The pattern for letters appears to be consecutive alphabetic progression (adding 1) until the last pair.

Number Progression Analysis

The numbers in the sequence are 2, 4, 6, 8, 12. Let's look at the steps between them:

• 2 to 4: Step is $+2$ ($4 - 2 = 2$)
• 4 to 6: Step is $+2$ ($6 - 4 = 2$)
• 6 to 8: Step is $+2$ ($8 - 6 = 2$)
• 8 to 12: Step is $+4$ ($12 - 8 = 4$)

The pattern for numbers appears to be adding 2 consistently until the last pair.

Establishing the Double-Step Pattern

The pattern observed in the first four pairs (Q2, R4, S6, T8) is:

• Increment the letter by 1 position in the alphabet.
• Increment the number by 2.

Following this pattern, after T8, the next pair should be:

• Letter: T $+1 \Rightarrow$ U
• Number: 8 $+2 \Rightarrow$ 10

Therefore, the expected next pair according to the pattern is U10.

Deviation Identification

The final pair given is V12. This deviates from the established pattern:

• The letter step from T to V is $+2$, not $+1$.
• The number step from 8 to 12 is $+4$, not $+2$.

Since V12 does not follow the "+1 letter, +2 number" progression seen in the earlier pairs, it is the pair that does NOT follow the double-step pattern.