Find all pairs of consecutive even positive integers, both of which are larger than 5 such that their sum is less than 23.

Find all pairs of consecutive odd positive integers both of which are smaller than 10 such that their sum is more than 11.

Find all pairs of consecutive odd natural numbers, both of which are larger than 10, such that their sum is less than 40.

Find all possible pairs of consecutive even positive integers such that each of them is greater than 15 and their sum is less than 49.

Find all possible pairs of consecutive even natural numbers, both of which are less than 12 and their sum is greater than 17.

Two consecutive odd natural numbers, both of which are larger than 10, such that their sum is less than 40, then the numbers are-

Find two consecutive positive odd integers, sum of whose squares is 290.

Find two consecutive positive integers, sum of whose squares is 613.

Let x and x+2 be two consecutive even positive integers, such that xgt12 and the sum of the integers is less than 39. Find all possible pairs of such integers.

Find all possible pairs of consecutive odd natural numbers such that each of them is smaller than 20 and their sum is greater than 32.

Find the standard deviation of first n even positive integers.