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In 34 or fewer tosses, the answer is 0. In infinitely many tosses, the answer is 1. The answer depends on the number of tosses and, since you have chosen not to share that critical bit of information, i is not possible to give a more useful answer.
10 coins would be tails up.
Theoretically, if you have a fair coin, the chances of landing on heads after 1000 tosses is 500, since there are only two outcomes, heads or tails, and each outcome is equally likely. Experimentally, however, the number of times the penny would turn up heads is any number from 1 to 1000, including 1 and 1000 (although these are very unlikely outcomes). The most likely outcome is a number very close to 500.
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 law of large numbers infers you will have 50% heads.