Answer: 0.26
Step-by-step explanation:
Binomial probability formula :-
, where P(x) is the probability of getting success in x trials , n is total number of trials and p is the probability of getting success in each trial.
Given : The probability of winning = 
Let X be the random variable that represents the number of sodas.
Since he is guaranteed that he will win one soda .
If Cody buys 6 sodas, then the probability that he will win at least one more soda will be :

Hence, the true probability he will win at least one more soda =0.26
Alice has 36 possibilities of choosing ,Bob 126 and Kevin 84.
Alice, Bob and Kevin
7 different Flavors:
Chocolate
Vanillla
mint chip
strawberry
cookie dough
banana
caramel
The order of the 9 scoops does not matter.
_ _ _ _
a) How many ways can she choose her 9 scoops so she gets at least 1 scoop of each flavor?
Since there are 7 flavors, and she wants at least one of each then we have:

Alice has 36 possibilites of choosing
b) Bob
Since Bob can't eat too much he can't do no more than 4

Bob has 126 possibilities of making his choice.
c) Kevin
3 scoups of banana or 3 scoups of strawberries.
Considering He wants 9 scoups.

Kevin has 84 possibilities for banana or strawberries
Use the pythagorean theorem:

where c is the hypotenuse of the triangle.