# Explain the Result of a Series of Bit String Operations

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1. For any bit string a, what is a XOR a XOR a XOR a XOR a equal to?

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##### Solution Summary

In this solution I provided a detailed explanation on how to evaluate the given expression containing bit strings and the boolean operator XOR.

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The XOR operation means "exclusive or". For a single bit operation the result of XOR is 0 if both bits are the same and 1 otherwise. Here is a truth table for a one-bit binary XOR:

A B (A XOR B)

--------------------

0 0 0

0 1 1

1 0 1

1 1 0

For a bit string the XOR is done each bit at a time. This example shows the XOR operation between two 4-bit ...

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