Question 1191059
.
A bowl contains 18 white, 10 black and 4 red buttons, if one button is drawn at random, 
a) what is the probability that it is red. 
b) what is the probability that it is red or black?
~~~~~~~~~~~~~~~~~~


<pre>
(a)  P = {{{4/(18+10+4)}}} = {{{4/32}}} = {{{1/8}}}.



(b)  P = {{{(10+4)/32}}} = {{{14/32}}} = {{{7/16}}}.
</pre>

Solved.