Question

A number is chosen at random among the first 120 natural numbers. the probability of the number chosen being a multiple of 5 or 15 is

Answer 1

we know the formula...total outcomes/favarable outcomes
totaloutcomes=120
favarable outcomes =24
multiple of 5
we know the formula
120/24
=5
so the probabilty is 5

do same prosses of 15 also

Answer 2

Answer:Total favourable outcomes/ Total outcomes

=. Multiple of 5 are :- 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100,105,110,115,120

:-These all multiple are 24 in number

Means - there are 24 multiple from 1 to 120 of 5.

You know that the formula of probability is Total favourable outcomes/Total outcomes

24/120 = 1/5 or 5.

Hope you will understand.

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