In a company 3/5 of people know shorthand 1/4th know typing and 1/5 know both. What fraction of people do not know both?

In a company 3/5 of people know shorthand 1/4th know typing 
and 1/5 know both. What fraction of people do not know both?

Ques:- In a company 3/5 of people know shorthand 1/4th know typing and 1/5 know both. What fraction of people do not know both?
2 6006

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