Probability 42081

What is the probability of any two-digit natural number
a) is divisible by seven,
b) is divisible by nine,
c) is not divisible by five.

Correct answer:

p1 =  0.1444
p2 =  0.1111
p3 =  0.8

Step-by-step explanation:

n=9 10=90 n1=(1009)/7=13 a=n1=13=13 p1=na=9013=0.1444
n2=(10010)/9=10 b=n2=10=10  p2=nb=9010=91=0.1111
n3=(10010)/5=18 c=n3=18=18 p3=1nc=19018=901 909018=90909018=909018=9072=54=0.8

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