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There are some places where four is IIII rather than IV. But that's not exactly proper. You shouldn't ever run into an occasion where you need 4 or more symbols in a row without being able to use a different symbol.
If no answer is repeated more than other answers in a data set
1/3(.3 repeated), 2/3(.6 repeated), 1/9(.1repeated), 2/9(.2 repeated), etc. There are billions of repeating decimals.
Mode: 17 (thenumber that is repeated more ofte n. 17 is repeated twice.)
Multiplication is repeated adding. Addition is a number with another number combined for a total.