Three coins are tossed. Describe Two events which are mutually exclusive but not exhaustive.

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When three coins are tossed, the sample space is given by

$S =\{ HHH , \,HHT , \,HTH ,\, HTT , \,THH , \,THT , \,TTH , \,TTT \}$

Two events which are mutually exclusive but not exhaustive can be

$A:$ getting exactly one head

$B:$ getting exactly one tail

i.e.. $A=\{H T T, \,T H T, \,T T H\}$

$B =\{ HHT ,\, HTH , \,THH \}$

This is because $A \cap B=\phi,$ but $A \cup B \neq S$

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