Question

Select the letter-cluster from among the given option that can replace the question mark (?) in the following series. I – 15, K – 17, M – 19, O – 21, ?, ? 

TYPE - 16
A Q – 23, S – 25
B Q – 25, M – 22
C S – 22, Q – 27
D S – 25, Q – 25
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