Need help with a Binomial Distribution question

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This is a Binomial Distribution question and I don't know how they got the (0.5)????, the one I marked on red. It's not mentioned in the question that's why I'm confused :/

please help and thanks in advance <3

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$\frac12$ is the probability of getting heads in one throw of a fair coin.

This is the $p$ parameter to the binomial distribution.