a) outcome - possible results of a random experiment is called its outcome .

b) set - all outcomes expressed in set .

c) trial - performence of a random experiment is called trial .

d) sample space - all possible results of an experiment is called sample space

e) event - it is occurrence of happening

for 3 childen boy = B , girl =G

sample space BBB , BBG , BGB , BGG , GBB , GBG , GGB , GGG

If order is also considered ,

probability of having 2 boys = ( favourable events ) / total events)

= 3/8

other wise

BBB , BBG , BGG , GGG

= 1/4

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