Shouldn't it even itself out to 50/50 over the full 100?
No. On average it should, but each toss is an individual event, in no way related to the previous one (as long as you assume there is no damage to the coin, surface, etc), so even if the previous 99 where heads, it makes no difference to the 100th throw.
No. On average it should, but each toss is an individual event, in no way related to the previous one (as long as you assume there is no damage to the coin, surface, etc), so even if the previous 99 where heads, it makes no difference to the 100th throw.