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Mathematics
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S.C.B.
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question
45
Which derivatives are eventually periodic?
Feb 9, 2016
answer
44
Multiple-choice: sum of primes below $1000$
Jan 30, 2017
answer
35
Prove that 10101...10101 is NOT a prime.
Feb 11, 2016
answer
32
What is a square root?
Mar 7, 2016
question
27
Numbers that are clearly NOT a Square
Feb 14, 2016
answer
25
How to prove that $\frac{1000!}{(500!)^2}$ is not divisible by 7?
Jan 24, 2017
answer
20
Prove $\frac{a^3+b^3+c^3}{3}\frac{a^7+b^7+c^7}{7} = \left(\frac{a^5+b^5+c^5}{5}\right)^2$ if $a+b+c=0$
Feb 18, 2016
answer
18
Sum of all Fibonacci numbers $1+1+2+3+5+8+\cdots = -1$?
Jan 4, 2018
answer
17
Finding how many 8-bit bytes contain an even number of zeros . . .
Mar 6, 2016
answer
15
Evaluate the limit at infinity
Feb 17, 2017
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What is the origin of 바가지를 쓰다?