Please Help with Summing

M

mrharlow

I have a large list of data, and certain subtotals.

Is there any way to have excel calculate which combination(s) of th
data sum to form a subtotal? This is really important, and if anyon
could help I would appreciate it
 
G

Gary''s Student

Use walking ones to generate the combinations:

For example, you have five items: 1,3,5,7,11 and you want to know which
sub-set will add up to 24.

In A1 put:
=ROW()
in B1 put:
=DEC2BIN(A1,5)

and copy down thru row 31. In C1 thru G1 put:
=(LEFT(B1,1))*1
=(MID(B1,2,1))*1
=(MID(B1,3,1))*1
=(MID(B1,4,1))*1
=(RIGHT(B1))*1 and also copy down thru row 31

In H1 thru L1 put your data:
1, 3, 5, 7, 11 and copy down

In K1 put:
=SUMPRODUCT(C1:G1,H1:L1) and copy down

Look for the 24 and get your sub-set.
 
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