(A)m must be an odd number. (b) M must be an even number.

(c) M is even only if A and B are even.

(d) M is even only if one of A and B is even and the other is odd.

2. let b < n<0 be equal to ()

Item (a), (b), (c) and (d) 3.

3. Given that A, B and C are positive integers and A and B are prime numbers, the value of a+b+C is ().

(A) 14。 (B) 13。 (C) 12。 (D) 1 1。

(English-Chinese dictionary positive integer: positive integer. Prime number: Prime number. )