4 items are filed under this topic.
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1/a + 1/b + 1/c < 1 |
2010-02-01 |
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From Mrityun:
suppose a,b and c are natural numbers such that 1/a + 1/b + 1/c < 1. Prove that
1/a + 1/b + 1/c < = 41/42.
Answered by Penny Nom and Claude Tardif. |
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39 consecutive natural numbers |
2003-08-19 |
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From A student:
Prove that among any 39 consecutive natural numbers it is always possible to find one whose sum of digits is divisible by 11.
Answered by Penny Nom. |
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Subsets of the natural numbers |
2001-01-30 |
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From Christina:
How do I explain why the set of natural numbers (N) cannot be equivalent to one of its finite subsets?
Answered by Penny Nom. |
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Natural numbers |
2000-04-12 |
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From Sara:
What is a natural number???
Answered by Penny Nom. |
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