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Jan
6
comment Dividing by $x!$
In your second question, you do not have identical flags for all countries.
Jan
6
reviewed Edit Dividing by $x!$
Jan
6
revised Dividing by $x!$
improved formatting
Nov
17
reviewed Looks OK Subsets in axiomatic set theory - ZFC
Nov
9
reviewed Looks OK Gradient of a dot product
Nov
9
comment Minimum and maximum values of $(\vec{r}\times\hat{j}).\vec{c}$
HINT: What would be $ \hat{k} \cdot \vec{c} $?
Nov
9
revised Minimum and maximum values of $(\vec{r}\times\hat{j}).\vec{c}$
deleted 14 characters in body
Nov
9
revised Linear equations modulo different prime through CRT
deleted 6 characters in body
Nov
3
comment Find the maximum of the following function
$\frac{dy}{dt}$
Nov
3
reviewed Edit Find the maximum of the following function
Nov
3
revised Find the maximum of the following function
Math modeling enter
Nov
2
revised If a matrix is row equivalent to some invertible matrix then it is invertible
added 13 characters in body
Nov
2
comment Making a determinant easier to solve to find characteristic polynomial
Did you try finding the characteristic equation after column operation as suggested in the question?
Nov
2
revised Making a determinant easier to solve to find characteristic polynomial
deleted 19 characters in body
Oct
31
reviewed Looks OK Why is this not a linear transformation from P2 to P3?
Oct
31
reviewed Looks OK if $a(b-c)x^2+b(c-a)x+c(a-b)=0$ has repeated roots prove…
Oct
30
revised How many 5-digit falling numbers are there?
deleted 1 character in body
Oct
30
answered Sum of real numbers and modular arithmetic
Oct
30
revised Solve this using modular arithmetic
deleted 24 characters in body
Oct
22
comment Anyway to solve this problem without calculation?
It should be $C_{19}^{20}$.