In the following expression which number should be added so that it becomes a complete square?
 1+3+7+9+11+13

The product of two consecutive positive natural numbers is 812. The greater of the two numbers is:

If X = {8ⁿ − 7n − 1 ; n ∈ ℕ} and Y = {49n − 49 ; n ∈ ℕ}, then:

Three positive integers a, b, c, have a sum of 15. Then the minimum value of $$(a-2)^2 + (b-2)^2 + (c-2)^2$$​ would be

The sum of two consecutive even numbers is 842. What is the smaller number?

If the sum of three consecutive odd numbers is 309, then the largest number among them is ___________.

​The difference between two numbers is 26. One number is 3 times of the other. The smaller number is:

The sum of a two-digit number and the number obtained by reversing the digits is 99. If the digits of the number differ by 5, then the two-digit number can be:

In the following expression which number should be added so that it becomes a complete square?
 1+3+7+9+11+13