need help with T/F questions for my electrical engineering class?

Update:

1. A mod-128 counter is a truncated counter.

2. Any Boolean function can be implemented using only NOR gates.

3. End around carry is an operation in 1's complement subtraction in which a 1 is added to the sum of the 2's complement of both operands.

4. A periodic digital signal that stays high for one third as long as it stays low has a 33% duty cycle.

Update 2:

5. A pair of states with the same outputs over the range of possible input combinations could possibly be equivalent.

6. Parity checking will not detect an odd number of errors.

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