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which product is undefined?

Mathematics
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1 Attachment
  • uri
matrics?
yeah

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Other answers:

  • uri
i don't get your question?
A. AB B. BA C. DB D. CD would these help
  • uri
wait so like you're asking me to slove all this and tell you from this which one's are impossibe?
  • uri
solve*
I think so :/ you see, the problem is, i dont know how to do it
matrix multiplication requires that the number of columns in the first one, matches the number of rows in the second one
  • uri
Okay wait :3
|dw:1371047591398:dw|
so? BD ???
does B have a different number of columns then D has rows?
essentially, we need to be able to pair up vectors|dw:1371047676408:dw| if we cant pair up the vectors, we can perform the operations
For each multiplication, count the number of columns for the first table and the number of rows for the second table. If they are equal, the multiplication is valid. Otherwise the product it is undefined.
  • uri
It's BA.
  • uri
Option no.B
if we notate this in row,column format A=3,2 B=2,2 C=3,1 D=1,2 (r,c)(r,c) | | these numbers have to equal
CD = 3,1 1,2 is valid DB = 1,2 2,2 is valid AB = 3,2 2,2 is valid BB = 2,2 2,2 is valid i think thats all the valid ones
For the AB multiplication. A has 2 columns, B has 2 rows, so the multiplication is valid. You do the same thing for the rest.

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