One of 10 keys open the door. If we try the keys one after another, then find the following: (i)               The probability that the door is opened on the first attempt. (ii)             The probability that the door is opened on the second attempt. (iii)           The probability that the door is opened on the 10th attempt.

One of the ten available keys opens the door. If we try the keys one after another, then find the following (i) the probability that the door is opened in the first attemt. (ii) the probability tht the door is opened in the second attempt. (iii) the probability that the door is opened in the third attempt. (iv) the probability that the door is opened in the tenth attempt.

One of the ten available keys opens the door. If we try the keys one after another, then find the following (i) the probability that the door is opened in the first attemt. (ii) the probability tht the door is opened in the second attempt. (iii) the probability that the door is opened in the third attempt. (iv) the probability that the door is opened in the tenth attempt.

One of the ten available keys opens the door. If we try the keys one after another, then find the following (i) the probability that the door is opened in the first attemt. (ii) the probability tht the door is opened in the second attempt. (iii) the probability that the door is opened in the third attempt. (iv) the probability that the door is opened in the tenth attempt.

If a refrigerator's door is opened , then we get

If a refrigerator's door is opened , then we get

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