Question

Heads I win, Tails you lose

Answer 1

John has 3 unique coins such that the probability of obtaining a head when the coin is flipped is \[\frac{1}{10},\frac{2}{10},\frac{ 3}{10}\], respectively. If he flips each of the 3 coins once, the probability that at least 1 heads appears is p. What is the value of \[1000p\]

Answer 2

If I understand this problem correctly, then they want you to use \[P(E)=\text{At least 1 heads in 3} \\
P(\overline{E})=\text{Maximum 0 heads in 3} \]
Then
\[\Large P(E)=1-P(\overline{E}) \]