Select the term that will logically complete the series at the question mark (?)
UCK-4, WFO-9, YIS-19, ALW-39, ?

Correct option is D

Given:

Series: UCK-4, WFO-9, YIS-19, ALW-39, ?

Formula Used:

Observe the pattern in the letters and numbers separately to identify the logic of progression.

Solution:

1. For the letters:

- The first letter sequence: U, W, Y, A. This sequence progresses by skipping one letter forward each time:

- U (skip V) -> W

- W (skip X) -> Y

- Y (skip Z) -> A

- The next letter would be C (skip B)

- The second letter sequence: C, F, I, L. This sequence increases by 3 positions each time:

- C + 3 -> F

- F + 3 -> I

- I + 3 -> L

- The next letter would be O (L + 3)

- The third letter sequence: K, O, S, W. This sequence increases by 4 positions each time:

- K + 4 -> O

- O + 4 -> S

- S + 4 -> W

- The next letter would be A (W + 4)

- Therefore, the next term for letters is COA

2. For the numbers:

- The sequence of numbers is 4, 9, 19, 39

- The difference between the terms is increasing as follows:

- 9 - 4 = 5

- 19 - 9 = 10

- 39 - 19 = 20

- Each difference is multiplied by 2 as we move forward.

- The next difference would be 40 (20 * 2)

- So, the next number is 39 + 40 = 79

Therefore, the answer is COA-79