The set of all natural numbers is
Fill in the blanks:
(a) The number 0 is not in the set of __________.
(b) The least number in the set of all whole numbers __________.
(c) The least number in the set of all even natural numbers is __________.
(d) The successor of 8 in the set of all natural numbers is ___________.
(e) The sum of two odd integers is ___________.
(f) The product of two odd integers is___________.
N is the set of all natural numbers .