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"In a class of $p$ students, the average (arithmetic mean) of the test scores is $70$.

In another class of $n$ students, the average of the scores for the same …

$\frac{1 + 2 + 3 + 4 + 5 + \ldots + 1000}{1001} =\ ?$

$\large 3^{4^{5^{\ldots^{999999999999999}}}}$

$$

What is the units digit of the number above?

$\sum_{n=1}^\infty \frac{1}{n^3}$

Is the sum above rational or irrational?

Find the lowest prime $p_n$ such that $p_n \pm p_{n - 1}$ are also primes. If there's none, enter $0$

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