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Jun
9
answered Solving recurrence similar to Catalan number recurrence
Jun
3
answered Name of the highest power of 2 smaller than or equal to a given number
May
7
answered Let $a,b$ be relative integers such that $2a+3b$ is divisible by $11$. Prove that $a^2-5b^2$ is also divisible by $11$.
Apr
29
answered Collection all cards in a cardgame
Apr
27
answered Algebraic simplification of likelihood ratio
Apr
17
answered How to evaluate $\log x$ to high precision “by hand”
Apr
8
answered Compute $\sqrt[7]{0.999}$ to three decimal places.(From Gelfand's Algebra text.)
Mar
12
answered $X,Y,Z$ are i.i.d $U(0,1)$. What is $P(X+Y+Z > 1)$?
Feb
25
answered Intersection of 8 spheres: find the volume
Feb
24
answered Is $\int_0^\infty x^{a-1} (1-x)^{b-1} e^{t-cx} dx$ integrable?
Feb
11
answered Find all perfect squares of the form aaa…a (n digits) bbb…b (n digits)
Jan
27
answered Value of lambda in poisson distribution
Jan
27
answered What is the coefficient of $(z-\pi)^2$ in Taylor series expansion of $\sin (z)/ (z-\pi)$
Jan
21
answered How to show that $\sum_{k=1}^n k(n+1-k)=\binom{n+2}3$?
Jan
15
answered How to solve for the parameters of the Gamma distribution given x for the 50th and 90th percentiles?
Jan
12
answered Odds of anyone in a group getting picked twice in a row
Jan
9
answered Is there a reason of $\cos(11x)+\sin(11(x+1))\approx 0$
Jan
7
answered Distinct ways three integers can sum to a constant
Jan
6
answered If a prime number is reversed, and then appended to itself, why is the result always a composite number?
Dec
19
answered how many ways to choose 3 coins?