If a and b are positive integers, a+b<20, and the product of ab...

Given any positive integer, show that two must exist whose sum or difference si divisible by 10.

Let k be a positive integer and p a prime number. Show that if p^2 is a factor of k, but p^3 is not...

If p is a positive integer and is greater than 3. How many prime integers are there in 3p including...

If x and y are positive integers, and square root = y + 3, then y^2 = ?

1. If b is a positive integer than 200, then how many integer pairs (a,b) satisfy the equation a/b=...

35. If b is a positive integer less than 400 and more than 100, then how many integer pairs (a,b) sa...

If n is a positive integer, then what is the value of (2/3)^n (1 1/2)^n-1? for positive integer n? E...

If n is a positive integer then show that 1+2+3+....+n=n(n+1)over 2

When a positive integer x is divided by 5 the remainder is 1. When x is divided by 8, the remainder...

Let n be a positive integer, and let S = {1, 2, 3, ..., n}. Three subsets A, B, C of S are chosen...

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