AIEEE Exam

Out of (2n + 1) tickets consecutively numbered, three are drawn at random. The chance that the numbers on them are in A.P. is

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AIEEE Other Question

If there dice are thrown, the probability that they show the numbers in A.P. is 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