If the product of 2 numbers is one, than those 2 numbers are recipricals
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If zero is counted as a whole number, then the first three whole numbers are zero, one and two and the product of ANY series containing zero is ZERO. If, on the other hand, only non-zero numbers are considered, then the series is one, two and three and the product is six.
One.
I'm not sure what you want. You can have 5 and 2 and any non-zero whole number. You can have 10 and any two non-zero whole numbers. You can have any even number, then any multiple of 5, then any non-zero whole number. Or any multiple of ten, then any two non-zero whole numbers. I think I covered the possibilities.
Natural numbers are:counting numbersnon-negative, non-zero integers; positive integersnon-zero whole numbers; positive whole numbers
The fact that they can be expressed as a ratio of two whole numbers (with the denominator being non-zero).