Answer:
9 times
Explanation:
coins have 2 sides to them, heads, and tails. so all u do is divide 2 by 18, and that equals 9 :)
9 or 3.8x10^-6
By flipping a coin you'd look at how many times a head could appear (1/2) and multiply that by the 18 times.
Another explanation:
I'm not sure on this but would you raise 1/2 to the 18th power?
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