Three coins are tossed once. Let $A$ denote the event ' three heads show ', $B$ denote the event ' two heads and one tail show ' , $C$ denote the event ' three tails show and $D$ denote the event 'a head shows on the first coin '. Which events are Compound ?
Three coins are tossed once. Let $A$ denote the event ' three heads show ', $B$ denote the event ' two heads and one tail show ' , $C$ denote the event ' three tails show and $D$ denote the event 'a head shows on the first coin '. Which events are Compound ?
When three coins are tossed, the sample space is given by
$S =\{ HHH ,\, HHT , \,HTH ,\, HTT , \,THH ,\, THT , \,TTH , \,TTT \}$
Accordingly,
$A=\{H H H\}$
$B =\{ HHT ,\, HTH ,\, THH \}$
$C =\{ TTT \}$
$D =\{ HHH , \,HHT , \,HTH , \,HTT \}$
We now observe that
$A \cap B$ $=\phi, A \cap C$ $=\phi, A \cap D$ $=\{H H H\} \neq \phi$
$B \cap C=\phi, B \cap D$ $=\{H H T,\, H T H\} \neq \phi$
$C \cap D=\phi$
If an event has more than one sample point of a sample space, it is called a compound event. Thus, $B$ and $D$ are compound events.
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- [JEE MAIN 2017]