Originally Posted by

**khamaar** If the sample space is a "set" then there should be no repetition in its elements right?

"A bag contains two red balls, three green balls and five black balls, calculate the probability of picking up a red ball with first try?"

Here the the probability would be "2/10" , cuz the sample space apparently contains 10 elements.

n(S)=10 S={red ball, red ball, red ball, green ball, green ball, green ball, black ball, black ball, black ball, black ball, black ball}

This set looks wrong... shouldnt it be, by the definition of sample set, n(S)= 3 &

S={ red ball, green ball, black ball}