Question: Using the Key C = ( 6 P + 3 ) mod 2 6 , encipher the plaintext: likes. What is the problem with this

Using the Key C=(6P+3) mod 26, encipher the plaintext: "likes". What is the problem with this key? Can you explain why?
Using the Key C=(6P+3) mod 26, encipher the plaintext: "likes". What

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