Real silver can have many different markings, ranging from 750 to 999- depending on the piece, common marks are : 800, 900, 925, 950.
Or on bullion (bars, coins.) 999.
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925
Not sure what the 2 means. But real silver will have a .925 stamp.
Can a ruby be real in a sterling silver ring
The square of a real number is always a real number.
Yes, zero is a real number. It is not a counting number, but it is an integer, a rational number, and a real number.