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Answer

Correct Option is Two

Solution: From the given statements, N attends before Friday. From this condition we have two possibilities that N attend conference either on Wednesday or Thursday. Three persons attend between N and the one who wears black tie.
The number of persons attend between N and the one who wears red tie is half than the number of persons attend between O and the one who wear blue tie. From this condition Case 1 is ruled out now because no option left for O and the one who wear blue tie so we continue in case 2.P attend just before the one who wear white tie and just after the one wear green tie. Here we get the final arrangement –Two persons attend the conference after the day on which the one who wears White Tie.

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