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Answer

Correct Option is R

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 –




R attends the conference on Saturday. 

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