Another answer
3261+6513=9874
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OPERATION
All those are examples of MATHEMATICAL OPERATIONS.
Addition and subtraction are mathematical processes. They can be used in equations, which are statements that the values of two mathematical expressions are equal, but they are not equations by themselves.
No. The identity for addition is zero; the identity for multiplication is one.
A one-block error in the transmitted ciphertext would result in a one-block error in the reconstructed plaintext for ECB mode encryption, while in CBC mode such an error would affect two blocks.