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True or False?
The infinite sequence $\big\lfloor 1\times \sqrt{ 2017 } \big\rfloor,\ \big\lfloor 2 \times \sqrt{ 2017 } \big\rfloor,\ \big\lfloor 3 \times \sqrt{ 2017 } \big\rfloor,\ \big\lfloor 4 \times \sqrt{ 2017 } \big\rfloor,\ \ldots$ contains infinitely many perfect squares.
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Notation: $\lfloor \cdot \rfloor$ denotes the floor function.
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Pi Han has written down a perfect square between 1 to 300 inclusive. Calvin wants to know the integer, and is allowed to ask "yes/no" questions to determine it. Pi Han would immediately answer the question, and then Calvin can use that information to ask his next question. As a point of pride, Calvin would not ask questions to which he already knows the answer. Calvin asks the following questions:
At this point, Calvin declares that he knows the answer. However, he turns out to be incorrect because Pi Han gave the wrong answer to each of the 4 questions!
What is the number in the envelope? If you think it cannot be uniquely determined, enter 0 as your answer.
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Clarification: Before the questions are asked, Calvin knows that Pi Han wrote down a perfect square between 1 and 300 inclusive.
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Parallelogram $ABCD$ with $AB = 10, BC =16, \angle ABC = 60^{\circ}$ has an inscribed ellipse such that the tangent point $E$ satisfies $CE = \frac{3}{4} CD$.
Find the length of the semi-major axis of this ellipse.
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Three points are chosen at random on the circumference of a circle with radius 1. Find the expected value, $v$, of the area of the triangle formed by the three points.
If $v = \dfrac{a}{b \pi}$, where $a$ and $b$ are coprime positive integers, submit $a+b$.
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$\frac{r^2}{s}+200=\frac{s^2}{r}+200^2$
In the equation above, $r$ and $s$ are both rational numbers and their difference is an integer.
What is the number of solutions to the equation?
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