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1 vote

How does the intercept parameter in a linear regression change when the data points are uniformly shifted?

answered Nov 20, 2015 at 16:52

6 votes

Accepted

Which integers $a, b, c$ satisfy the equation $a \sqrt 2 − b = c \sqrt5$?

answered Nov 20, 2015 at 14:10

12 votes

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How to explain the division rule in counting problem in a easy way?

answered Nov 19, 2015 at 7:18

8 votes

Accepted

Combinatorial interpretation of explicit formula for Stirling numbers of the second kind

answered Nov 16, 2015 at 10:22

2 votes

Accepted

Prove the identity $x^n = \sum^{n}_{k=0}S_{n,k}(x)_k$

answered Nov 14, 2015 at 16:26

2 votes

Accepted

Counting the number of words made of $2n$ letters

answered Nov 14, 2015 at 16:07

1 vote

Accepted

Represent $f(x)=\frac{1}{(1-x^2)^4}$ as a power series

answered Nov 12, 2015 at 12:12

3 votes

Accepted

show $ \int_{-\pi}^{\pi} (4\arctan (e^x)-\pi)dx=0$ without calculating

answered Nov 12, 2015 at 11:38

1 vote

Binomial expansion to find a specific term (coefficient)

answered Nov 3, 2015 at 11:10

2 votes

Accepted

Find the indefinite integral $\int {dx \over {(1+x^2) \sqrt{1-x^2}}} $

answered Oct 30, 2015 at 16:05

1 vote

Intuition for why variance of sample means depends only on sample size?

answered Oct 28, 2015 at 7:26

1 vote

Accepted

Precalculus - Where is this (trig) function positive and negative?

answered Oct 27, 2015 at 3:36

1 vote

Demonstration with complex numbers by using conjugates,

answered Oct 25, 2015 at 16:15

0 votes

Finding real numbers such that $(a-ib)^2 = 4i$ Prove that $(a^2 - b^2) = 0$

answered Oct 24, 2015 at 17:30

2 votes

Solve using AM GM Inequality if possible

answered Oct 24, 2015 at 15:41

4 votes

Accepted

Number of possible subsets of all sizes

answered Oct 24, 2015 at 14:54

2 votes

Accepted

How many different ways are there to tile a corridor of $2 \times N$

answered Oct 24, 2015 at 11:06

0 votes

Find $\theta$ in the given triange

answered Oct 24, 2015 at 4:53

1 vote

Accepted

combinations of cancelling pairs

answered Oct 23, 2015 at 18:18

3 votes

Accepted

Arrangements with restrictions

answered Oct 23, 2015 at 16:12

2 votes

Accepted

Formula for the $n$th term of $3/2+21/4+63/8+177/16....$

answered Oct 23, 2015 at 14:44

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21 Answers

How does the intercept parameter in a linear regression change when the data points are uniformly shifted?

Which integers $a, b, c$ satisfy the equation $a \sqrt 2 − b = c \sqrt5$?

How to explain the division rule in counting problem in a easy way?

Combinatorial interpretation of explicit formula for Stirling numbers of the second kind

Prove the identity $x^n = \sum^{n}_{k=0}S_{n,k}(x)_k$

Counting the number of words made of $2n$ letters

Represent $f(x)=\frac{1}{(1-x^2)^4}$ as a power series

show $ \int_{-\pi}^{\pi} (4\arctan (e^x)-\pi)dx=0$ without calculating

Binomial expansion to find a specific term (coefficient)

Find the indefinite integral $\int {dx \over {(1+x^2) \sqrt{1-x^2}}} $

Intuition for why variance of sample means depends only on sample size?

Precalculus - Where is this (trig) function positive and negative?

Demonstration with complex numbers by using conjugates,

Finding real numbers such that $(a-ib)^2 = 4i$ Prove that $(a^2 - b^2) = 0$

Solve using AM GM Inequality if possible

Number of possible subsets of all sizes

How many different ways are there to tile a corridor of $2 \times N$

Find $\theta$ in the given triange

combinations of cancelling pairs

Arrangements with restrictions

Formula for the $n$th term of $3/2+21/4+63/8+177/16....$