# Basic Maths Grand Test - Q7

If a person visits his dentist, suppose the probability that he will have his teeth cleaned is 0.48, the probability that he will have a cavity filled is 0.25, the probability that he will have a tooth extracted is 0.20, the probability that he will have a teeth cleaned and a cavity filled is 0.09, the probability that he will have his teeth cleaned anda tooth extracted is 0.12, the probability that he will have a cavity filled and a tooth extracted is 0.07, and the probability that he will have his teeth cleaned, a cavity filled,and a tooth extracted is 0.03. What is the probability that a person visiting his dentist will have at least one of these things done to him ? asked Nov 17, 2019
reshown Nov 20, 2019 answered Nov 21, 2019 by (6,370 points)

Let

probability that he will have his teeth cleaned be

probability that he will have a cavity filled be

probability that he will have a tooth extracted be

Given that

answered Nov 21, 2019 by (2,920 points)
edited Jan 10 by
it is +0.03,
so 0.65+0.03=0.68
yeah thanks for correcting