Question

A box contains $20$ cards, numbered from $1$ to $20$. A card is drawn from the box at random. Find the probability that the number on the card drawn is even

Answer 1

Even number $=2,4,6,8,10,12,14,16,18,20=10$
Prime Number $2,3,5,7,11,13,17,19=8$
Multiple of $3=3,6,9,12,15,18=6$
Probability of getting an Even Number $=\frac{NumberofEvenNumbers}{TotalNumbers}=\frac{10}{20}=\frac{1}{2}$