Is the given conjecture a valid rule for the following sequence? if not, give a counterexample. sequence: 1, 2, 3, 6, 18, 108, conjecture: multiply the previous 2 terms to get the next term. a. yes, the rule holds. b. no; 3 is a counterexample. c. no; 6 is a counterexample. d. no; 108 is a counterexample.