Answer:
C
Step-by-step explanation:
Look for the case in which every input is unique (no repetitions).
A does not qualify, as 3 appears as an input twice.
B does not qualify, for the same reason
C qualifies (is a function), because all the inputs {1, 2, 3, 4} are unique.
D does not qualify (see A, above).
5^5
He has 5 choices day 1
5 choices day 2
5 choices day 3
5 choices day 4
5 choices day 5
5*5*5*5*5 = 5 ^5
Answer: 50,001²-49,999²=0,2.
2
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