08:58
d.
{(a, 2)}
QUESTION 19
Let f be a function on Z+ (the set of positive integers) defined by (x, y) E f
iff y = 2x²-7 (f C Z+ ? Z+) The relation f is NOT surjective.
Which of one of the following values for y provides a counterexample that can be
used to prove that f is not surjective?
Select one:
a.
y = 12
b.
y = 1
c.
y = 25
d.
y = 43
QUESTION 20
Suppose U = {1, 2, 3, 4, 5, a, b, c} is a universal set with the subset
A = {a, b, c, 1, 2, 3, 4}. Which one of the following relations represents a
surjective function from U to A?
Select one:
a.
{(a, 4), (c, c), (5, 1), (3, a), (4, 2), (b, b), (1, 3)}
b.
{(1, 1), (3, 3), (5, c), (2, 2), (4, 4), (c, a), (b, b), (a, b)}
c.
{(1, 4), (2, 3), (3, 2), (4, 1), (a, c), (b, b), (c, a)}
d.
{(1, c), (2, c), (3, c), (4, c), (5, c), (a, c), (b, c), (c, c)}
QUESTION 21
III
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