SOLUTION: A stained glass window has 25 blue pieces and 20 red pieces. If 2 pieces are selected at random, what is P(2 red or 2 blue)?

Question 589901: A stained glass window has 25 blue pieces and 20 red pieces. If 2 pieces are selected at random, what is P(2 red or 2 blue)?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A stained glass window has 25 blue pieces and 20 red pieces. If 2 pieces are selected at random, what is P(2 red or 2 blue)?
---
red and blue are mutually exclusive events.
----
P(2red OR 2blue) = P(2red) + P(2blue) = 20C2/45C2 + 25C2/45C2
------
= [20C2+25C2]/45C2 = 490/990 = 0.4949
==========================================
Cheers,
Stan H.
=========
RELATED QUESTIONS
At a candy store, there are 200 pieces of bubble gum in a bubble gum machine. *... (answered by ewatrrr)

According to company reports, the current mix of colors for M&M dark chocolate candies... (answered by edjones)

A bag of M&Ms has 50 M&M pieces. Of these, 20 M&M pieces are brown, 16 pieces are red, 8... (answered by ewatrrr)

At a candy store, there are 200 pieces of bubble gum in a bubble gum machine. *... (answered by stanbon)

To make a stained glass window,Robert used 16 pieces fo glass.Seven of the pieces were... (answered by JBarnum)

There are 18 red, 15 white, and 12 blue pieces of candy in a bag. What is the... (answered by Alan3354)

A bag contains 4 blue marbles and 5 red marbles. If 2 marbles are selected at random... (answered by scott8148)

3. You have a bag containing 4 pieces of red candy, 2 pieces of green candy, and 3 pieces (answered by vleith)

A bag contains 20 M&M's; 5 are blue, 9 are red, and 6 are yellow a) If 2 M&M's are... (answered by edjones)