Letter series solving strategies – UGC NET Question

Statements A, B and D describe genuine features of letter series. A is correct because positions like A=1, B=2 are routinely used to detect shifts. B is true since many series move letters by a fixed pattern that repeats. D is also correct because repeated blocks such as ABCABC suggest a repeating cycle whose length is diagnostic. C is false because there is no requirement that vowels and consonants alternate, and E is false as alternate positions can follow a second rule, so A, B and D only are correct.

Option A:
Option A is incomplete since it leaves out D. Without checking repeating blocks, the strategy for handling many cyclic letter series is not fully described, so A and B alone do not constitute the entire correct set.

Option B:
Option B is correct because it gathers the alphabet-position idea, cyclic shifts and block detection, all of which are central to solving letter series, and excludes C and E, which over-restrict possible patterns.

Option C:
Option C is wrong as it includes E, claiming that two rules cannot govern alternate positions, which is directly contradicted by many exam examples, and it omits B, losing an important cyclical feature.

Option D:
Option D is incorrect because it accepts E and drops A, thereby discarding the basic alphabet-position tool while also denying multi-rule patterns, so it cannot represent the set of correct statements.