SOLUTION: Please help me to solve this, from 20 tickets marked with the first 20 numerals, one is drawn at random. what is the probability that it will be a multiple of 3 or 7. thank y

Question 1086790: Please help me to solve this,
from 20 tickets marked with the first 20 numerals, one is drawn at random. what is the probability that it will be a multiple of 3 or 7.
thank you:)

Answer by mathmate(429) (Show Source): You can put this solution on YOUR website!
Question:
From 20 tickets marked with the first 20 numerals, one is drawn at random. what is the probability that it will be a multiple of 3 or 7.

Solution:
It is assumed that it is equally probability to draw any of the 20 tickets.
then
P(3)=1/20
P(7)=1/20
P(3 or 7)=1/20+1/20=2/20=1/10
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