A coin is tossed 7 times. Then the probability that at least 4 consective heads apear is

An unbiased coin is tossed 12 times The probability that at least 7 consecutive heads show up is K/256 then K=

A coin is tossed four times. The probability that atleast one heads turns up is

If an unbiased coin is tossed 10 xx then the probability that no two consecutive heads occurs is

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

A coin is tossed 6 times . Find the probability of getting at least 3 heads .

A coin is tossed 3 times. The probability of obtaining at least 2 heads is

A coin is tossed n times . If the probability of getting at least one head is greater than 0.9 then the minimum vaue of n is