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Help 8,9

 Apr 26, 2018
 #1
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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

 

cool cool cool

 Apr 26, 2018

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