At Westonci.ca, we provide reliable answers to your questions from a community of experts. Start exploring today! Our platform offers a seamless experience for finding reliable answers from a network of knowledgeable professionals. Get immediate and reliable solutions to your questions from a community of experienced professionals on our platform.

Explain whether the following given sets are closed under addition:
a .B ={0}
b. T = {0, 3, 6, 9, 12, . . . }
c. N = {1, 2, 3, 4, 5, . . .}
d .V = {3, 5, 7}