Which statements are true?

1/√21=√21/42
6/√21=2√21/7
7/√21=√42/6
14√21=2√21/3

Someone . me. compound probability

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3

In a column proof the right column states your reasons