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Solution


Q.

In a group of 20 people, 5 can’t swim. If one person is selected at random, then the probability that he/she can swim, is 
1 3/4  
2 1/3  
3 1  
4 1/4  

Ans.

(1)

It is given that in a group of 20 people, 5 can not swim.

∴ Number of people who can swim = 20 − 5 = 15

Thus, probability that a person selected at random can swim

=1512=34