Show that the given set has a cardinality of 0 by establishing a one-to-one correspondence between the elements of the given set and the elements

Show that the given set has a cardinality of ℵ0 by establishing a one-to-one correspondence between the elements of the given set and the elements of

 N. {10, 5, 0, −5, −10, −15,..., −5n + 15,...}