In a college campus the seniors thought of ragging the newly joined students. In one room only girls were made to sit, in another room only boys were there. In the third room both girls and boys were present. They closed the doors and labelled all the rooms wrongly. On each room they stuck one of the paper " boys only",  "girls only" "both boys and girls"  but all the rooms were wrongly marked.
Now they called the juniors and told the above facts. They put a condition that if any one new comer can find the rooms correctly, then they won't rag any of the students the whole year. But the student is allowed to knock only one room and only one person will come out of that room. He has to find correctly in which room there are girls only, boys only, both boys and girls.

Can you help him?

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