
The probability of getting 0 heads in 4 tosses (or equivalently, 4 tails) is

.
So the desired probability is
Step-by-step explanation:
DA=13.................
Answer:
The answer is 7.2368421053 .
Solve for f:(i - 47/12) + f = 18
(i - 47/12) + f = f + (-47/12 + i):
f + (-47/12 + i) = 18
Subtract -47/12 + i from both sides:
Answer: f = 263/12 - i