For each of the two sets below, determine whether the set is bounded above. if it is not, write not bounded above. if it is, write bounded above and find its supremum. if a set has a maximum, find it. if not, write no maximum. determine whether the set is bounded below. if it is not, write not bounded below. if it is, write bounded below and find its infimum. if a set has a minimum, find it. if not, write no minimum. (a) s = { 3 − 1 n2 : n ∈ n } (b) s = { n − 1 n : n ∈ n }