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$P, Q, R,$ and $S$ crossed a lake in a boat that can hold a maximum of two persons, with only one set of oars. The following additional facts are available.

- The boat held two persons on each of the three forward trips across the lake and one person on each of the two return trips.
- $P$ is unable to row when someone else is in the boat.
- $Q$ is unable to row with anyone else except $R.$
- Each person rowed for at least one trip.
- Only one person can row during a trip.

Who rowed twice?

- $P$
- $Q$
- $R$
- $S$

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By going through the above criterion we can conclude the following statements

In the first forward trip, Q and R will go and on this trip, Q will row.

Now, R will come back on the 1st return trip and R will row.

In the 2nd forward trip, R and P will go and R will row.

Now, P will come back on the 2nd return trip and P will row.

In the 3rd forward trip, P and S will go and S will row.

**So, R rowed Twice. option C)**

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