# RektTheNoob

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### A bin has 8 black balls and 7 white balls. 3 of the balls are drawn at random. What is the probability of drawing 2 of one color and 1 of th

RektTheNoob  Sep 25, 2017
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1386
1
+473

### For each integer $n$, let $f(n)$ be the sum of the elements of the $n$th row (i.e. the row with $n+1$ elements) of Pascal's

RektTheNoob  Sep 25, 2017
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1020
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### Find the sum of all positive integers such that their expression in base $7$ digits is the reverse of their expression in base $16$ digits.

RektTheNoob  Sep 25, 2017
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754
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+473

### Let $f(n)$ return the number of distinct ordered pairs of positive integers $(a, b)$ such that for each ordered pair, $a^2 + b^2 = n$. Note

RektTheNoob  Sep 12, 2017
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594
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### Both $a$ and $b$ are positive integers and $b > 1$. When $a^b$ is the greatest possible value less than 399, what

RektTheNoob  Sep 9, 2017
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578
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+473

### For how many integers n where is ​ odd?

RektTheNoob  Sep 9, 2017
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1098
3
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### Two different integers from 1 through 20 inclusive are chosen at random. What is the probability that both numbers are prime? Express your a

RektTheNoob  Sep 9, 2017
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447
1
+473

### While staying in a 15-story hotel, Polya plays the following game. She enters an elevator on the $6^{\mathrm{th}}$ floor. She flips a fair c

RektTheNoob  Sep 9, 2017
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517
1
+473

### How many ways are there to put 4 balls in 3 boxes if the balls are not distinguishable but the boxes are?

RektTheNoob  Sep 9, 2017
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922
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### Two different natural numbers are selected from the set $\ \allowbreak \{1, 2, 3, \ldots, 6\}$. What is the probability that the greatest co

RektTheNoob  Sep 6, 2017