alleryWhich number leaves any whole number unchanged when it multiplies that number?
A0
B10
C1
D2
Answer & Solution
Correct answer: C. 1
1. We need a number m with a x m = a for every a.
2. Only 1 works, since a x 1 = a.
3. Zero would turn every product into 0.
_Source: Wikipedia, Natural number, Algebraic properties satisfied by the natural numbers_
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