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6h
revised $7^{6} | (a+b+ab)^2$ Find the value of $a,b$
added 241 characters in body
18h
revised Expectation number of games until A or B wins in 2 consecutive games
deleted 483 characters in body
23h
revised Are there an infinite number of prime numbers where removing any number of digits leaves a prime?
added 37 characters in body
1d
revised Find the probability of getting one diamond and one spade in a five-card hand, using binomial coefficients.
added 1 character in body
1d
revised Find all prime p such that Legendre symbol of $\left(\frac{10}{p}\right)$ =1
added 175 characters in body
1d
revised Are there an infinite number of prime numbers where removing any number of digits leaves a prime?
added 22 characters in body
2d
revised Elementary number theory with some arithmetic progression.
u
2d
revised $xP(|X|>x) \rightarrow 0 $ implies $E|X|^{1-\epsilon} < \infty$
added 135 characters in body
2d
revised Prove $O(f(n)+g(n)) = O(f(n))$ when $g(n)=O(f(n))$
added 683 characters in body
2d
revised How to read this problem from Dummit-Foote's “Abstract Algebra”?
added 8 characters in body
2d
revised at what interest rate can one double his initial deposit after 3 years, if the interest is compound semiannually? 24.5% 0.245% 112.25% 1.12%
added 228 characters in body
2d
revised Geometric, Arithmetic Progression
added 63 characters in body
2d
revised Geometric, Arithmetic Progression
added 92 characters in body
2d
revised How many $5$-digit numbers (including leading $0$'s) are there with no digit appearing exactly $2$ times?
added 19 characters in body
2d
revised How many $5$-digit numbers (including leading $0$'s) are there with no digit appearing exactly $2$ times?
added 86 characters in body
Apr
30
revised Charmichael number square free
added 42 characters in body
Apr
29
revised Finding the sum of all products of pairs of distinct primitive roots mod 83
added 89 characters in body
Apr
29
revised Finding the sum of all products of pairs of distinct primitive roots mod 83
deleted 53 characters in body
Apr
29
revised If $f'(x)\rightarrow \infty$ then $f(x)\rightarrow\infty$?
added 11 characters in body
Apr
29
revised Find the sum using
added 967 characters in body