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What should come in place of the question mark(?) in the following letter series?
AC, EG, IK, MO, ?
Here, the series is formed by writing every alternate letter in the alphabetical series.
Even the pairs of the letters are formed in the same manner.
Here, after O, the alternate letter in alphabetical series is Q.
The Q will form pair with the sucessive alternate letter i.e S.
Hence, QS is the pair.
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