Consider the real-valued sequence bn = = { 1 n if n is even if n is odd n (a) Does {b} have an upper bound? Either way prove it, and if so, give or estimate the least upper bound and justify it. (b) Does {b} have a lower bound? Either way prove it, and if so, give or estimate the least upper bound and justify it. (c) and justify. Does {b} have a limit? Either way, prove it, and if so, give or estimate it