17. All three‐digit numbers that can be formed using the digits 1, 2, 3, 4, and 5 without

Question

repeating the digits are
(a) 50.
(b) 60.
(c) 15.
(d) 71.
18. One of the counting rules used to determine the total number of possible outcomes for
experiments in which the order of selection does not matter or the one that ignores the
order of selection is
(a) filling the slot.
(b) k‐step experiment.
(c) permutations.
(d) combinations.
19. The number of ways of selecting k distinct objects from a group of n distinct objects
where the order of selection is important is known as
(a) number of combinations of n objects using k objects at a time
(b) number of permutations on n objects using k at a time.
(c) number of filling n slots after the first slot is filled.
(d) number of combinations of all objects in the experiment.