Which of the following can be used to illustrate that not all prime numbers are odd? 

 

The sum of a non-zero number and its reciprocal is 2. What is the number?

Which of the following numbers is completely divisible by 99?

Product of digits of a 2-digit number is 18. If we add 63 to the number, the new number obtained is a number formed by interchange of the digits. Find the number.

Which of the following is not a Triangular number?

Find a two digit number which is exactly three times the product of its digits?

Product of digits of a 2-digit number is 72. If we add 9 to the number, the new number obtained is a number formed by interchange of the digits. Find the number.

What should be the missing digit so that the number 275_476 becomes exactly divisible by 11?

Find two numbers whose sum is 29 and the product is 100.