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(a) How many keys are there for (i) shift ciphers, (ii) affine ciphers, (iii) general substitution ciphers, (iv) Viginere ciphers where the keyword has length

(a) How many keys are there for (i) shift ciphers, (ii) affine ciphers, (iii) general substitution ciphers, (iv) Viginere ciphers where the keyword has length 3?

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