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OpenStudy (anonymous):
81 is a composite number. True False
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OpenStudy (anonymous):
True
OpenStudy (anonymous):
how it is true. explain please..
OpenStudy (mertsj):
A number is composite if it has some other factor besides 1 and itself. So since 81 = 9 times 9, it has a factor of 9 which is different from 1 and 81. Therefore it is composite.
OpenStudy (anonymous):
81 has factors other than 1 and itself, so it is not a prime number
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