Luck of the flip, but they do not always land heads up.
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Ten pennies lined up in a line can show the same number of heads/tails patternsas the highest binary number you can count to with ten bits.That's 1,024 .
Each time you toss two pennies, there are four ways they can land: H H H T T H T T One of the four ways is (Heads - Heads), so the probability of 2 heads is 1/4 or 25% . If the pennies are 'fair' (not loaded), and you toss them a large number of times, you should expect 2 heads roughly 1/4 of the time. Out of 20 tosses, that's 5 times. But don't bet on it.
The probability that exactly one will land heads up is 0.15625
No, when you toss a coin there is a 50 percent chance it will land heads up.
It is 0.5