Question

Cards, each marked with one of the 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 gettinga card with number less than 10 ?
(a) $\frac{3}{5}$ (b) $\frac{1}{3}$ (c) $\frac{1}{2}$ (d) $\frac{2}{5}$

Answer 1

the cards are marked with the numbers 6 to 15 and are mixed well before removing one card out.

need to find out :
probability of getting a card with a number less than 10

solution :
probability = number of favorable events / total number of events
the number that are below 10 = 4
the total number of cards with all numbers = 10
probability = 4/10
= 2/5
∴ the probability of getting a number below 10 = 2/5