For each subset of R, give its infimum and and the minimum of each set, if they exist. Otherwise write "none"

a) {1,3}

b) {pi, 3}

c) [0,4]

d) (0,4)

e) {1/n: n is an element of N}

f) {1 - 1/n: n is an element of N}

g) {n/(n+1): n is an element of N}

h) {(-1)^n(1+1/n): n is an element of N}

i) {n + (-1)^n/n: n is an element of n}

j) (-infinity, 4)

m) {r is an element of Q: r<5}

n) {r is an element of Q: r^2<=5}

thanks for everyones help!