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We know that probability of an event ranges between 0 and 1.

Now by the rule 

                     p(X<a)=1-p(X`>=a` ). Where X is a random variable

So              p(X<6)=1-p(X`>=` 6).

e.g. In throwing of dice experiment




Here  we see 

           P(X`>=` 6)=P(X=6)=1/6.

So,       1-P(X`>=` 6)=1-1/6=5/6.

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