Explanation
Ordinal numbers represent position or rank in a sequential order.
They are normally written using a number + letter suffix: 1st, 2nd, 3rd, etc.
All other numbers use the 10 suffix values inside CHOOSE.
The ABS function is used to handle negative numbers as well as positive numbers.
The values provided to CHOOSE can include references.
ABS Function
The Excel ABS function returns the absolute value of a number.
ABS converts negative numbers to positive numbers, and positive numbers are unaffected.
MOD Function
The Excel MOD function returns the remainder of two numbers after division.
For example, MOD(10,3) = 1.
The result of MOD carries the same sign as the divisor.
