Looking at the series: Z_25YB23XC_W_19_E17
Let me identify the pattern by grouping the terms into triplets (Letter, Letter, Number):
Given series with blanks numbered:
- Z [1] 25
- Y B 23
- X C [2]
- W [3] 19
- [4] E 17
Examining the numbers in each triplet:
25, 23, [2], 19, 17
The numbers decrease by 2 each time:
25−2=23
23−2=21
21−2=19
19−2=17
Therefore, blank [2] = 21
Examining the first letters of each triplet:
Z, Y, X, W, [4]
These are consecutive letters going backwards in the alphabet.
Therefore, blank [4] = V
Examining the second letters of each triplet:
[1], B, C, [3], E
These are consecutive letters going forwards in the alphabet: A, B, C, D, E
Therefore, blank [1] = A and blank [3] = D
The complete series is:
(Z, A, 25), (Y, B, 23), (X, C, 21), (W, D, 19), (V, E, 17)
The missing terms in order are: A, 21, D, V
This matches Option 4.