With most coins, if you flip them, you will have a slightly better chance of getting tails than heads. This is because coins usually have a bust or portrait on the obverse which makes that side a wee bit heavier than the weight provided by the design on the reverse. If you were to flip a U.S. penny (the kind with the Lincoln Memorial on the back) 1,000 times, it would probably come up heads about 495 times and tails 505.
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