When coin 1 is flipped, it lands on heads with probability

(a)  If coin 1 is flipped 11 times, find the probability that it lands on heads at least 9 times. 
(b)  If one of the coins is randomly selected and flipped 10 times, what is the probability that it lands on heads exactly 7 times? 
(c) 
In part (b), given that the first of these 10 flips lands on tails, find the conditional probability that exactly 7 of the 10 flips land on heads. just do c! 
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