Cards Were numbered from 1 to 100 ...
find the probability of getting a
2)a composite no.
3)no.s divisible by 2
4).no.s divisible by 3
5).no.s divisible by 5
cards are numbered from 1 to 90
you must find the number of prime numbers between 1 and 100 including both 1 and 100.
Divide that number by 100 and you will get the answer for the first part.
Similarly for the other parts.
Note that a number is divisible by 2 if the unit place of that number has 0,2,4,6 or 8.
Anumber is divisible by 3 if the sum of the digits of that number is divisible by 3.
A number is divisible by 5 if the unit's place has either 0 or 5 .
Use these tests of divisibility to gind the answers of3rd, 4th and 5th part of the question.