Question 1119228
Three unbiased coins are tossed
a) draw a diagram showing all possibilities
2 possibilities for each coin.  3 coins --> 2^3 = 8 possibilities
---
<pre>
H H H
H H T
H T H
H T T
T H H
T H T
T T H
T T T
</PRE>

b) find the probability of obtaining at least one tail
At least 1 tail is all 8 except for H H H --> 7/8