How many plaintext blocks will be corrupted, Computer Network Security

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How many plaintext blocks will be corrupted

Problem

Let M be a message consisting of b DES blocks (say n = 100). Alice encrypts M using CBC mode and transmits the resulting ciphertext C to Bob. Due to a hardware error, ciphertext block number n/2 is corrupted during transmission. All other ciphertext blocks are transmitted and received correctly. Once Bob decrypts the received ciphertext, how many plaintext blocks will be corrupted?

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