There are 1000 junior and 800 senior students in a class. And there are 60 sibling pairs where each pair has 1 junior and 1 senior.1 student is chosen from senior and 1 from junior randomly.What is the probability that the two selected students are from a sibling pair?
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Three men goes to a hotel to stay ,the clerk says $30 per room/day so all the three plans to stay in one room so each pays $10.After some time the clerk realises that he made a mistake of collecting $30 but the room cost only $25,there fore he decides to return $5 to them so he calls the room boy and gives him $5 asking him to return. The room boy keeps $2 with him and he returns only $3($1 for each). Now Totally all have paid $9 each($27)+room boy $2 which is equal to $27.where did $1 go,who has made the mistake?
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