Alex has 5 shots at a dart board. He knows the probability of getting a bullseye is 0.6.

a) Find the probability that

i) No bullseye is hit. I get

ii) At least one bulleyes is hit. I get

Here's where the confusion sets in.

b) Find the number of throws required such that the probability of at least one bullseye being thrown is at least 0.7

I know I have to make something >0.7.