How many ways can a person toss a coin 13 times so that the number of tails is between 7 and 9 inclusive
1 answer:
Answer:
3718 ways
Step-by-step explanation:
How many ways can a person toss a coin 13 times so that the number of tails is between 7 and 9 inclusive
Probability is the likelihood for an event to occur or not
The formula for a combination is:
n choose r = n! / (r! x (n-r)!)
n=13
r=7 to 9
We are going to add up the cases for 7 through 9:
++
++
1716+1287+715
3718 ways
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