Question

An integer is chosen between 0 and 100. what is the probability of getting not divisible by 9?

Answer 1

sample space divisible by 9
( 9, 18,27,36,45,54,63,72,81,90,99)
therefore there would be only 11 number divisible by nine in numbers 1 to 100
so rather than these eleven would be
100-11
=89
so probability of getting a number not divisible by 9 would be =89/100
= 0.89

Answer 2

the numbers divisible by 9 are (9,18,27,36,45,54,63,72,81,90) =10
the no. of possible outcomes =100
the no. of favourable outcomes =100-10
=90

probability =90/100
=9/10

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