Probability 4020

There are numbers from 1 to 20 in the hat. What is the probability that we will pull out from the hat:

a / one-digit number
b / prime number
c / number greater than 11
d / a number divisible by six
Thank you

Correct answer:

a =  0.45
b =  0.35
c =  0.45
d =  0.15

Step-by-step explanation:

n=20 a=9/n=9/20=0.45
p1={ 2,3, 5, 7,11, 13,17} b=7/n=7/20=0.35
p2 = { 6,12,18 } d=3/n=3/20=0.15

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