Q: How many numbers is western union reference number?

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No, it is uncountable. The set of real numbers is uncountable and the set of rational numbers is countable, since the set of real numbers is simply the union of both, it follows that the set of irrational numbers must also be uncountable. (The union of two countable sets is countable.)

No, the set of mixed numbers is a subset of the set of rational numbers. For example the mixed number 1 Â¼ is the same as the improper fraction 5/4 [a rational number]. Note that it is a subset, because integers are also rational numbers, but a mixed number will not be an integer. Also, any fraction between 0 and 1 will not be a mixed number.

The set of whole numbers.

Assuming that you mean opposites (rather than oppisites), the answer will depend on what kind of opposites: additive opposites or multiplicative opposites.In the first case you have the same set as you started with: whole numbers.In the second, you will have the set that consists of the union ofall whole numbers,all unit fractions between -1 and +1. But, you have a problem with zero: its multiplicative opposite is not defined.

A singleton point is a closed set. The natural numbers can be written as a countable union of points. Thus, they form a Borel set.

Related questions

10

Western Union Money Transfer Control Numbers (MTCN #) are 100 numbers long.

The fact that the person giving it to you called it a "reference number" and not an "MTCN/Money Transfer Control Number" (the term used by Western Union themselves) is not a good sign.Valid MCTNs are 10 digits, but the only way to know for sure if one is "good" is to contact Western Union. You need the MCTN (and a valid ID) to pick up the funds, but you can also track the transfer on Western Union's website if you have the MCTN. If the website can't find the MCTN you were given, that's a very bad sign.

the ans is 10 digit

there are 387

With serial number 6395-408AK this is what a western union code looks like.

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The real numbers.

2

union J's phone number is 0771124356

Using a different phone than your own, call the number. If your phone rings, then it is your number. If the phone is answered by a Western Union clerk, than it is not your number.

The real number are the union of rational and irrational numbers.