If a coin is tossed four times then the probability of getting tails at least once is

A biased coin in which probability of getting head is twice to that of tail. If coin is tossed 3 times then the probability of getting two tails and one head is

A coin is tossed once. Find the probability of getting a tail.

If a coin is tossed four xx then the probability that head appears at least once is

A coin is tossed once. What is the probaility of getting a tail?

A pair of coins is tossed 7 times. Find the probability of getting at least five tails

If a fair coin is tossed 8 times , then the probability that it shows heads at least once is

A coin is tossed n times. The probability of getting head at least once is more than 0.8 , then the value of n is

A coin is tossed n times. The probability of getting head atleast once is greater than 0.8. Then the least value of such n is