Question

Let E be any event,then p(E)+p(notE)=

Answer 1

p(E)+p(not E) = 1.........

Answer 2

$\underline {\blue{ Complementary \:events :}}$

Consider an event has few outcomes.

Event of all other outcomes in the sample survey which are not in the favourable event is called complementary event.

$\pink { For \: any \: E , P(E) + P(\overline {E} )} = \underline { \green { 1} }$

$Where , \overline { E } \:stands \: for \: "not \:E " ,\\ E \: and \: \overline { E } \: are \: called \\ complementary \: events .$

$\red { P(E) + P( not \:E ) } \green { = 1 }$

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