Tue February 17, 2009 By:

cards are numbered from 1 to 90

Expert Reply
Tue February 17, 2009

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.

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