Answer: The required probability is 0.32.
Step-by-step explanation:
Since we have given that
Probability of winning team A over B = 0.7
Probability of losing team A over B = 0.3
Number of matches = 7"
So, using the "Binomial distribution" :
We get that

Hence, the required probability is 0.32.
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First box: 7 to the power of 2
second box: 7
third box: 7 to the power of four
first box: m to the power of 2
second box: m to the power of 5