Oookay :D that is mathematically correct, 50% if we have only 2 chances = head or tail, that's right.
But...lets get a roulette in casino.
we have 3 rows
imagine we have this output sequence : 1 1 2 2 1 1 1 2
What is a chance of getting a 3rd row on 9th game ?
8/9 ? right? please do not say me 33.33% :D