3. Recall Z = { . . . ,-2-1, 0, 1, 2, . . . } (the integers). Let Z+ = {1, 2, 3, . . .} be the positive integers. Let 2Z be the even integers, 3Z be the multiples of 3, and so on. (a) Is Z+ c 2Z? Explairn. (b) Is 2Z c Z+? Explain. (c) Find 2Zn3Z. Describe the set in words, and using set notation