Let r and s be binary relations on a set a. suppose that r is an equivalence relation and that s is symmetric, and transitive but is not reflexive. which statement is always true for any such r and s?
(a)r? s is symmetric but not reflexive and not transitive.
(b)r? s is symmetric but not reflexive.
(c)r? s is transitive and symmetric but not reflexive
(d)r? s is reflexive and symmetric

The fraction of defective integrated circuits produced in a photolithography process is being studied. a random sample of 300 circuits is tested, revealing 17 defectives. (a) calculate a 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool. round the answers to 4 decimal places. less-than-or-equal-to p less-than-or-equal-to (b) calculate a 95% upper confidence bound on the fraction of defective circuits. round the answer to 4 decimal places. p less-than-or-equal-to