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What should come in place of the question mark (?) in the given series based on the English alphabetical order?
RPE YWL FDS MKZ ?
TGR
TRG
THY
TGU
TRG
Quick Trick: Examine the 1st letter of each 3-letter group: R(18) -> Y(25) -> F(6) -> M(13). Notice the constant addition of +7. Therefore, M(13) + 7 = 20, which corresponds to T. Looking at the options, Options A, B, C, and D all start with T, so...
Examine the 1st letter of each 3-letter group: R(18) -> Y(25) -> F(6) -> M(13). Notice the constant addition of +7. Therefore, M(13) + 7 = 20, which corresponds to T. Looking at the options, Options A, B, C, and D all start with T, so check the 2nd letter: P(16) -> W(23) -> D(4) -> K(11), which also increases by +7. So, K(11) + 7 = 18, which corresponds to R. Thus, the middle letter is R, giving TRG instantly!
First Letter Pattern Analysis
Map the 1st letters of each term to their 1-based alphabetical positions: R = 18, Y = 25, F = 6, M = 13. The progression follows +7 additions (18 + 7 = 25; 25 + 7 = 32 = 26 + 6 -> F; 6 + 7 = 13 -> M). Adding 7 to M (13 + 7 = 20) yields T.
Second Letter Pattern Analysis
Map the 2nd letters of each term to their positions: P = 16, W = 23, D = 4, K = 11. The progression follows +7 additions (16 + 7 = 23; 23 + 7 = 30 = 26 + 4 -> D; 4 + 7 = 11 -> K). Adding 7 to K (11 + 7 = 18) yields R.
Third Letter Pattern Analysis
Map the 3rd letters of each term to their positions: E = 5, L = 12, S = 19, Z = 26. The progression follows +7 additions (5 + 7 = 12; 12 + 7 = 19; 19 + 7 = 26 -> Z). Adding 7 to Z (26 + 7 = 33 = 26 + 7) yields G.
A: Incorrect second and third letters (G, R instead of R, G). C: Incorrect second and third letters (H, Y instead of R, G). D: Incorrect third letter (U instead of G).
B is correct because each letter position advances consistently by +7 places in the alphabet, giving 13+7=20 (T), 11+7=18 (R), and 26+7=7 (G), which forms TRG.
In alphabetical series questions, always write down the numerical position of the first two terms immediately; noticing constant differences like +7 early saves time from tracking every letter individually.