2. What is the cardinality of each of the following sets?

a){1, 2, 3, 4,,9 }

b){1, 3, 5, 7, 9, ,99 }

c) {N, R}

d) {x Z | x is odd and |x| < 10}

e) {{ }, }

f) {x R | x²< 10}

g) {{ }, , {{ }} }

h) {{ }, , {, { }} }