**Question:**

A number, *n*, is defined as a "tweener" if both *n* - 1 and *n* + 1 are prime. Which of the following numbers is a tweener?

**Option A):**

30**Option B):**

8**Option C):**

2**Option D):**

48**Option E):**

36

**Correct Answer is Option A):**

30

**Explanation:**

Don't fall into the trap of thinking that 1 is prime. Two numbers, 1 and 0, are called -"special." Thus, 2 isn't a tweener because 2 - 1 = 1 and 1 isn't prime. The number 8 isn't a tweener, because 8 + 1 = 9 and 9 isn't prime, either. (It's 3 3.) But 30 is a tweener because 30 - 1 = 29, which is prime, and 30 + 1 = 31, which is also prime. After you've found the answer, you can move on to the next question; there's no need to check the last two options, which are wrong.