Letting $W$ Stand for the Set of Whole Numbers, I the Set

question 72

Multiple Choice

Letting $W$ stand for the set of whole numbers, I the set of integers, $I ^ { + }$ the set of positive integers, and $I ^ { - }$ the set of negative integers, perform the indicated operation.
-Find $\mathrm { I } ^ { + } \cap \mathrm { I } ^ { - }$

• A) \(\mathrm { I } ^ { - }\)
• B) \(\mathrm { I } ^ { + }\)
• C) I
• D) \(\varnothing\)

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