Four one-rupee coins and three 50 paise coins are placed at random in line. Prove that the probability of the extreme coins being both 50 paise is `(1)/(7)` .

Three coins are tossed. If one of them shows tail, then find the probability that all three coins show tail.

A unbiased coin tossed three times. Find the probability of getting 1 head

Three Coins are tossed: What is the probability of getting at least one tail?

A box contains two 50 paise coins, five 25 paise coins and a certain fixed number N(geq2) of 10 and 5-paise coins. Five coins are taken out of the box at random. Find the probability that the total value of these 5 coins is less than 1 rupee and 50 paise.

A bag contains n+1 coins. If is known that one of these coins shows heads on both sides, whereas the other coins are fair. One coin is selected at random and tossed. If the probability that toss results in heads is 7/12, then find the value of ndot

If A and B each toss three coins. The probability that both get the same number of heads is

An unbiased coin is tossed three times in succession, then the probability of getting exactly one head is

A bag contains 10 rupee - coins, 7 fifty-paise coins and 4 twenty finve-paise coins. Fine the probability of drawing (i) a rupee-coin (ii) three rupee-coins and (iii) three coins, one of each type, in the random drawing of three coins from the bag.

There are coins of one rupee and 50 paisa in a box owned by elder brother of Mitali. The total value of the coins is Rs. 350. The sister of Mitali replaces (1)/(3) rd of the 50 paisa coins in the box by equal number of one rupee coins , so that the total value of the coins now becomes RS.400 . Determine the number of one rupee coins and 50 paisa coins each.

There are three coins. One is two headed coin, another is a biased coin that comes up head 75% of the time and third is an unbiased coin. One of the three coins is chosen at random and tossed. If it shows head, what is the probability that it was the two headed coin ?