I think it’s the first one. 30:54 because 5 times 6 is 30 and 9 times 6 is 54.
the answer would be x=−0.870452,0.712370
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.