Originally Posted by

**joshuaa** # 1

A three sided spinner is numbered 3, 4, 5. A five sided spinner is numbered 3, 3, 4, 6, 6. Both are spun at the same time. Draw a sample space and find the probability that:

a) the sum of the scores is a prime number.

b) the product of the scores is greater than 16.

c) the difference in the score was exactly 1.

-----------------------------------------------------------------

# 2

A bad contains three red balls, 5 yellow balls, and 2 green balls.

A ball is selected at random, the color noted then it is put back into the bag.

A second ball is then selected at random from the bag.

a) A third ball is selected. Find the probability all three balls selected are yellow.

---------------------------------------

my attempt for # 1

S = {(3,3),(3,3),(3,4),(3,6),(3,6),(4,3),(4,3),(4,4),( 4,6),(4,6),(5,3),(5,3),(5,4),(5,6),(5,6)}

prime sum = (3,4),(4,3),(4,3),(5,6),(5,6) ...........probability = (1/3)(1/5) + (1/3)(2/5) + (1/3)(2/5) + (1/3)(2/5) + (1/3)(2/5)

---------------------------------------------

for # 2

probability = (5/10)(5/10)(4/9)

----------------------

Can you tell me why my answers not correct???