Question

a number is selected from first 100 natural numbers. what is the probability that it is a multiple of 3 or 5

Answer 1

there r 20multiples of 5in 1st 100 natural nos.

p(multiple of 5)=20/100=1/5

Answer 2

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