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James has 10 markers in a backpack. One of them is yellow and one is blue. What is the probability James will reach into the backpack without looking and grab the yellow marker and then reach in a second time and grab the blue marker if:

(a) the first marker is not replaced?

(b) the first marker is replaced?

Express your answers as fractions in simplest form.

 

a. (a) 1/19 (b) 1/10

b. (a) 1/10 (b) 1/19

c. (a) 1/90 (b) 1/100

d. (a) 1/100 (b) 1/90

RainbowPanda  Mar 26, 2018
 #1
avatar
+2

(a) the first marker is not replaced?

1/10 x 1/9 = 1/90

 

(b) the first marker is replaced?

1/10 x 1/10 = 1/100

Guest Mar 26, 2018
 #4
avatar+1215 
-1

Thank you

RainbowPanda  Mar 26, 2018
 #2
avatar+87562 
+2

a) Not replaced

Yelllow marker First - Then Blue Marker  =

 

(1/10)(1/9)  =  1/90

 

b) Replaced

 

(1/10) (1/10)  = 1/100

 

Answer   "C"

 

 

 

cool cool cool

CPhill  Mar 26, 2018
 #5
avatar+1215 
-1

Thank youuu!

RainbowPanda  Mar 26, 2018
 #3
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0

the answer is D

Guest Mar 26, 2018

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