+128474 8. We have 12 pens to choose from and 10 highlighters to choose from
7 of the pens are black and 8 of the 10 highlighters are NOT green....so.....
P(Black Pen ) = 7/12
P (Not a Green Highlighter) = 8/10
So...P (Balck Pen and not a Green Highlighter) = (7/12) * (8/10) = 56/120 = 7/15
9. The odd primes are : 3,5,7,11,13, 17 = 6 odd primes
P ( Even or Odd Prime ) = P(Even) + P(Odd Prime) - P(Even and Odd Prime) =
10/20 + 6/20 - 0/20 =
16/20 =
4/5 =
.8
