Concatenate permutations between two columns

Question

I need help with an excel assignment.

Name    City
---------------
John    London
Maxx    NY
Ashley  DC
        Paris

Solution for this mus

Answer 1

Here's an Array Formula you can use, though you will need to modify the size of the matrix depending on how many entries you have

=CONCATENATE(INDEX(A:A,MMULT(ROW(A1:A3),TRANSPOSE(ROW(B1:B4))/TRANSPOSE(ROW(B1:B4)))),"-",INDEX(B:B,MMULT(ROW(A1:A3)/ROW(A1:A3),TRANSPOSE(ROW(B1:B4)))))

Assuming Column A is Names and Column B is Cities, you would select 12 cells (3 rows high, 4 columns wide), paste the above formula in the first cell and press Ctrl + Shift + Enter to create the array formula.

If you want to see a little simpler version to see what it does before the INDEX references, check with the same area:

=CONCATENATE(MMULT(ROW(A1:A3),TRANSPOSE(ROW(B1:B4))/TRANSPOSE(ROW(B1:B4))),"-",MMULT(ROW(A1:A3)/ROW(A1:A3),TRANSPOSE(ROW(B1:B4))))

Here's a screenshot (with the formula split in 2 lines) of the single formula displaying the output over multiple cells: