Public Sub FiftyFifty1()
Dim x As Integer, y As Integer

With ActiveSheet
For y = 1 To 50
For x = 0 To y
.Cells(y, 1 + x).Value = y - x & "/" & x
Next x
Next y
End With
End Sub

The above bit of code generates a bunch of pairs of numbers in a wedge-
shaped pattern on a spreadsheet.
If you copy and run it you'll see the pattern.

What I want is to generate another wedge-shaped pattern of pairs of
numbers starting on line 51 and going to line 100, where line 51 has
50 elements: 50/1, 49/2, 48/3 . . . 3/48, 2/49, 1/50 (all pairs add up
to 51)
line 52 has 49 elements: 50/2, 49/3, 48/4 . . . 4/48, 3/49, 2/50. (all
pairs add up to 52)
Line 99 has 2 elements: 50/49, 49/50 (add up to 99)
Line 100 has only: 50/50.