The simple answer is, You Don't. It's a fake.
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2 because it can either be heads or tails:) but if the coin is a 2 headed quarter only one.
Double headed novelty and Magician's coins have no numismatic value, but depending on the denomination an quality most are under $10.00.
There is the probability of 1/2 if it is a fair coin. There is the probability of 1 if it is a double-headed coin. There is the probability of 0 if it is a double-tailed coin.
One quarter of 2 is 0.5.
Since 1 + 1 = 2, then 1 quarter + 1 quarter is 2 quarters. 2 quarters make 50 cents.