(1) Find the adjoint of the following :
(2) Find the inverse (if it exists) of the following:
(3)
(4)
(5) If A =
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15) Decrypt the received encoded message [2 -3] [20 4] with the encryption matrix
and the decryption matrix as its inverse, where the system of codes are described by the numbers 1-26 to the letters A− Z respectively, and the number 0 to a blank space. Solution
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