the probability of occurrence of an event A is 0.7, the probability of non occurrence of another event B is 0.5 and of at least one of A or B not occurring is 0.6.Find the probability that at least one of A or B occurs.​

Nathan is an ecologist. he’s studying the effect of secondary consumers on primary consumers. his current research focuses on a population of blue jays and crows. they eat caterpillars and mice. if the number of blue jays increases, what are the likely effects on other populations? 1the number of crows will increase. 2the number of mice will decrease. 3the number of mice will remain the same. 4the number of caterpillars will decrease.