Solution:
We know that,
The probability of winning of A
Probability of losing of A
And,
Probability of losing of A
Probability of winning of B
Therefore,
Probability of winning of A
Probability of winning of B
Probability of winning of B
Hence, probability of winning of B
We know that,
Probability of winning of B
Probability of losing of B
And, probability of losing of B
Probability of winning of A
Therefore,
Probability of winning of A