SOLUTION: A counter is drawn from a box containing 10 {{{highlight(cross(rod))}}} <U>red</U>, 15 black, 5 green and 10 yellow counters. Find the probability that the counter is A. Black

Algebra ->  Probability-and-statistics -> SOLUTION: A counter is drawn from a box containing 10 {{{highlight(cross(rod))}}} <U>red</U>, 15 black, 5 green and 10 yellow counters. Find the probability that the counter is A. Black       Log On


   



Question 1193723: A counter is drawn from a box containing 10 highlight%28cross%28rod%29%29 red, 15 black, 5 green and 10 yellow counters.
Find the probability that the counter is
A. Black
B. Not green or yellow
C. Not yellow
D. Red or black or green
E. Not blue

Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.

In all cases, the probability is a fraction, whose denominator is the full number of counters.


In each case, the numerator of this fraction is the number of counters under given description.


This hint is enough for you to complete the rest on your own.


For example, in case (a), the answer is  15%2F%2810%2B15%2B5%2B10%29 = 15%2F40 = 3%2F8.


In case (b), the answer is  %2810%2B15%29%2F40 = 25%2F40 = 5%2F8.

And so on . . .