Probability 71204

On ten identical cards, there are numbers from zero to nine. Determine the probability that a two-digit number randomly drawn from the given cards is:
a) even
b) divisible by six
c) divisible by twenty-one

Correct answer:

p1 =  0.5062
p2 =  0.1728
p3 =  0.0494

Step-by-step explanation:

n=9 1+8 9=81  n1=9 1+(5+3) 4=41  p1=nn1=8141=0.5062
n2=3 1+3 41=14  p2=nn2=8114=0.1728
21;42;63;84  n3=4  p3=nn3=814=0.0494

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