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Ten slips of paper labeled from 1 to 10 are placed in a hat. The first slip of paper is not replaced before selecting the second slip of paper.

What is the probability of selecting a number less than 2 then a number greater than 7?

 

A. 3/50

B. 1/15

C. 3/100

D. 1/30

 Feb 6, 2018
 #1
avatar+100571 
+3

 

P(number  < 2  on first draw)   =  1/10

 

P ( number > 7 on second draw given that a number < 2  was selected first)  =  3/9

 

So...the total probability is   (1/10) * ( 3/9)   =   3/90  =  1 / 30

 

 

cool cool cool

 Feb 6, 2018

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