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Select the letter cluster from among the given options that can replace the question mark (?) in the following series: PRT, OQS, NPR, ?

1. GAS
2. MJS
3. GHA
4. MOQ

Correct answer: MOQ

Solution

In the series, the first letters go P, O, N, ... which decrease by 1 each time. The second letters go R, Q, P, ... and the third letters go T, S, R, ... so the next cluster is M, O, Q.

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