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Finding the N people

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N people were in a party and were seated in a circular manner. If each of the two present in
the party, except the pairs that were adjacent,sang a song and If a song lasted for 2 mins and
28 mins was taken for singing the songs, find N.

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The songs sang is Nc2 - N


So, N is 7 (total 14 songs are sung so N must be multiple of 7)
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