Let a = {x, y, z}, b = {y, z, w}, c = {y, z, v}. which of following is correct?
a)
(a ? b) ? ( a ? c) = a ? (b ? c)
b)
(a ? b) ? (a ? c) = {y, z}

The table shows a pattern of exponents. what is the pattern as the exponents decrease?

Math each whole number with a rational,exponential expression

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.