A number is selected from the first 100 natural numbers. The probabality that the number is divisible by by 7 is
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hi
aim : number is selected from first 100 natural numbers. what is the probability that it is a multiple of 3 or 5
numbers from first 100 natural numbers
= 1 to 100
= 100 numbers
now from 1 to 100 how much are divisible by 3 and 5?
hcf of 3 and 5
= 3*5
= 15
so now
number of multiples of 3 + number of multiples of 5 - number of multiples of 15
100/3 +100/5 - 100/15
nearsest one
33 + 20 - 6
47 numbers
now probality = 47/100
hope it helps u
:0
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