As we said, once every people had its own way of counting, highly developed civilization made use of a numbering system (the Romans used the Roman Empire, the Arabs that Arab, and so on ...) Today our system of numeration is Arabic, consisting 10 symbols from these figures .
The numbers are formed by
one or more digits arranged in sequence: 2, 34, 89, 123 ...
are called natural numbers are infinite. In fact, we can write a sequence of numbers that never ends, always adding a digit to the number in question, adding however we always get a number greater than the previous year.
A sequence is in ascending order when the figures of which consists ranging from minor to major. Instead, when they go in descending order from highest to lowest.
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