AIEEE Exam

The key for opening a door is in a bunch of 10 keys. A man attempts to open the door by trying the keys at random discording the wrong key. The probability that the door is opened in the 5th trial is

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AIEEE Other Question
Out of (2n + 1) tickets consecutively numbered, three are drawn at random. The chance that the numbers on them are in A.P. is If P(A) = 3/4 , P(B) = 2/5, P(A - B) = 1/ 4
then
P(A + B) = ?