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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?
Dec
18
answered Four dice, probability that difference of some outcomes is equal to others
Dec
16
answered Expected value of a die when decision to role again depends on previous outcome
Dec
11
answered Chance of having score of 63
Dec
9
answered Why is this true? (sum of 2 uniform distributions)
Dec
8
answered Why is $\frac {1\cdot2\cdot3\cdot…\cdot n}{(n+1)(n+2)…(2n)}\le \frac 1 {n+1}$