Since we have chosen 2 letters, then the total probability
of winning the game is the sum of the probabilities of each letter. Therefore:
Total probability of winning = Probability of D +
Probability of H
Total probability of winning = 5% + 10%
Total probability of winning = 15%
Since we are playing the game for 20 turns, therefore out of
those 20 games, we will win 15% of the time. So:
15% = 0.15
Winning times = 0.15 * 20
Winning times = 3
Therefore we have a chance or probability to win at least 3
games out of 20 turns.
