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161?85?65?89=100
then use + or - in place of ? and take + as m,- as n then find value of m-n

options:
1)3
2)-1
3)1
4)-3

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Any one got the mail for next round for todays drive?? (Held in delhi) 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?