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.

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

If the door of a refrigerator is kept open, then which of the following is true

If the door of a refrigerator is kept open, then which of the following is true

Explain the following When a corridor train suddenly starts, the sliding doors of some compartments may open.

Tickets are numbered from 1 to 10. Two tickets are drawn one after the other art random. Find the probability that the number on one of the tickets is a multiple of 5 and on the other a multiple of 4.

Two cards are drawn one after another from a pack of 52 ordinary cards. Find the probability that the first card is an ace and the second drawn is an honour cards.

Three persons, Aman, Bipin and Mohan attempt a Mathematics problem independently. The odds in favour of Aman and Mohan solving the problem are 3:2 and 4:1 respectively and the odds against Bipin solving the problem are 2 :1 Find (i) The probability that all the three will solve the problem (ii) The probability that problem will be solved

If two coins are tossed simultaneously, find the probabilities of the following events: (i) two heads (ii) at least one head (iii) at most one head.

In a bag there are 20 cards 10 names A and another 10 names B. Cards are drawn randomly one by one with replacement then find probability that second A comes before third B