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What is the inverse of a product AB, assuming both factors are invertible?

  • A.the transpose of the product AB
  • B.the inverse of B times the inverse of A
  • C.the inverse of A times the inverse of B
  • D.the product of the two inverses in either order

Answer: B

Reversing the order is what allows the product with AB to collapse to the identity, since the inner factors cancel in sequence. The rule mirrors the transpose rule exactly, and both follow from the associativity of the multiplication.

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