CHOOSE(index_num, value1 [,value2] [..])

Returns the value in a row (or column) based on an index number.

index_numThe position you want to return.
value1The first value.
value2(Optional) The second value.

* This function can return multiple values.
* The "index_num" can be between 1 and 29 that specifies which value to choose.
* If "index_num" = 1 then "value1" is returned.
* If "index_num" = 2 then "value2" is returned, and so on.
* If "index_num" < 1, then #VALUE! is returned.
* If "index_num" > the number of arguments, then #VALUE! is returned.
* If "index_num" is a fraction, it is truncated to the lowest integer before being used.
* If "index_num" is an array, every value is evaluated.
* The "index_num" can be a formula or reference to a cell containing a number between 1 and 29.
* The "value" arguments can be numbers, cell references, named ranges, formulas, functions or text.
* You can have a maximum of 255 arguments.
* You can use the INDEX function when you have more than 255 values.
* You can use the MATCH function to return the position of a value.
* You can use the SUM function to return the total value of the numbers in a list, table or cell range.
* The equivalent VBA function is VBA.CHOOSE
* For the Microsoft documentation refer to

1=CHOOSE(2,"1st","2nd","3rd","Finished") = 2nd3
2=CHOOSE(B1,"Nails","Screws","Nuts","Bolts") = Nuts2
3=CHOOSE(B2,"Nails","Screws","Nuts","Bolts") = Screws12
4=CHOOSE(2.5,"Nails","Screws","Nuts","Bolts") = Screws 
5=CHOOSE(B2,"First","Second","Third") = Second 
6=CHOOSE(5,"Mon","Tue","Wed","Thu","Fri","Sat","Sun") = Fri 
7{=CHOOSE({3,4},"Mon","Tue","Wed","Thu","Fri","Sat","Sun") } = {Wed, Thu} 
8{=CHOOSE({4,3},"Mon","Tue","Wed","Thu","Fri","Sat","Sun") } = {Thu, Wed} 
9=CHOOSE(2,"1st",named_range,"2nd","3rd","4th") = 12 
10=CHOOSE(-1,"Nails","Screws","Nuts","Bolts") = #VALUE! 
11=CHOOSE(5,"1st","2nd","3rd","4th") = #VALUE! 
12=CHOOSE(2,{1,2,3,4}) = #VALUE! 
13=SUM(CHOOSE(2,B1,B1:B2,B1:B3)) = 5 

1 - What is the 2nd item in the given list.
2 - What is the 3rd item in the given list.
3 - What is the 2nd item in the given list.
4 - What value is returned when the index number is 2.5.
5 - What is the 2nd item in the given list.
6 - What is the 5th item in the given list.
7 - What are the values 3 and 4 in the given list.
8 - What are the values 4 and 3 in the given list.
9 - This function can return values from cells with named ranges.
10 - What if the index number is less than one.
11 - What if the index number is greater than the number of arguments.
12 - What if the second argument is a list.
13 - This function can return multiple values from cell references. This function returns the array {3,2} which is range "B1:B2" which is then passed to the SUM function.

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