Matrix multiplication indicates a row-by-column multiplication, where the entries in the Xth row of A are multiplied by the corresponding entries in the Yth column of B and then adding the results.

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Hill cipher cryptanalysis - known plaintext known key size

Hello I want to know how to go about this problem I know the plaintext "abcdef" and the ciphertext. The key size is 2. I really can't figure out how to find the key for decrypting and encrypting.