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Select the letter-cluster that replaces the question mark: ABC, EFG, IJK, ?
MNO
NOP
OPQ
LMN
MNO
Observe the first letter of each cluster: A (+4) = E (+4) = I (+4) = M, followed by consecutive alphabetical order.
Observe the first letter of each cluster: A (+4) = E (+4) = I (+4) = M, followed by consecutive alphabetical order.
Analyze First Letters
The first letters of the clusters are A (1), E (5), and I (9). Each increases by 4 positions: A + 4 = E, E + 4 = I, I + 4 = M (13).
Form Complete Cluster
Starting with M, the next consecutive letters are N and O, forming the cluster MNO.
B: NOP starts with N instead of M. C: OPQ starts with O. D: LMN starts with L and does not follow the correct +4 progression.
A is correct because the first letter progresses by a gap of 3 letters (+4 step) to reach M, completing the MNO cluster.
For alphabetical series questions, always check the progression of both the starting letter of each group and the internal sequence of letters within the group.
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