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You can divide 6 into equal parts of 1, 2, 3, or 6 (but not 4 or 5) because 6 is divisible by these numbers. The rules of divisibility have wide-ranging applications as an easy test for divisibility.

Is 87985 divisible by 7?

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by
**
Victor Paes Plinio**

Find the smallest positive multiple of nine containing only even digits.

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**
A K**

How many perfect squares have the property that all of their digits are equal?

**Details and Assumptions**

- For this question, \(0=0^2 \) is also a perfect square.

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by
**
Satvik Golechha**

Given that \(a\) and \(b\) are integers, what can we conclude about the expression

\[ \left( { a }^{ 2 }+a+2011 \right) \left( 2b+1 \right) ? \]

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**
Krishna Ramesh**

\[\frac{(n+2)!}{(n-1)!}\] The above fraction is divisible by which of the following?

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by
**
Pranay Singh**

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