Suppose that we are interested to count the number of integers not divisible by 7, 8, 9 between 1 to 10000. Explain the steps as needed. (b) Given R is a relation on the set of integers Z, and R is defined as: R = {(a, b)|a, b Z, 2a, 2b < 0 or a, b 0} (a) Explain if R is symmetric, reflexive, antisymmetric, transitive. Use examples as needed. urgent pls