Question

from a set of 12 cards numbered 1 2 3 ..............12 find the probabilty of getting a prime number

Answer 1

Now, between 1 to 12, there are total 5 prime number as:
2, 3, 5, 7,and 11

∴ Number of favourable outcomes = 5
number of favourable outcomes ÷ total number of outcomes =5/12

Answer 2

prime numbers are 1 2 3 5 7 11

p(prime number)=no.of prime number/total number of cards

= 6/12

=1/2