Explain simply why (B) is the correct answer to: If X and Y are both positive two-digit integers and share no digits, and X > Y, what is the smallest possible value of X - Y?
Options:
(A) 0
(B) 1
(C) 2
(D) 3
(E) 9. Explanation:
Answer = B = 1
20 - 19 = 30-29 = 40-39 = 50-49 = 1