Cards, each marked with one of he numbers 6, 7, 8, ...., 15, are placed in a box and mixed thoroughly. One card is drawn at random from the box. What is the probability of getting a card with number less than 10?
Total numbers of elementary events are 15 – 5 = 10
Let E be the event of drawing card less than 10
Favourable numbers are: 6, 7, 8, 9
Numbers of favourable outcomes = 4
P (E = 4/10 =2/5