Write 2-digit odd numbers whose sum of digits is 8.
Solution:
Write all pairs of 2-digit twin primes such that on changing the places of their digits, they still remain prime numbers.
Solution:
There are just four natural numbers less than 100, which have exactly three factors. One of them is 25, what are the other three? What can be said about these numbers?
Solution:
More Solutions:
- There are three heaps of rice weighing 120 kg.
- State which of the following collections are set:
- Let E = {even integers}.
- Write the following sets in roster form:
- Write the following sets in tabular form:
- {x : x is a prime number less than 30}
- State whether the following sets into empty.
- State whether the following pairs of sets are equal or not:
- A collection of ……… objects is called a set.
- Which of the following collections is a set?