Statement 1: X - 15 is a whole number, this shows x can be any integer in the region (-∞, ∞), then we get X as an odd number or an even number, Thus, we cannot say that whether X + 6 is an odd or even number. ⇒ Statement 1 is not true. Statement 2: X - 6 is an odd number, this shows that X is an odd number, Thus, we can say that X + 6 is an odd number, ⇒ Statement 2 is true. ∴ Statement 2 alone is sufficient to answer the question while statement 1 alone is not sufficient to answer the question.