TRUE OR FALSE 14. A circuit containing only OR and Nht gates must be a combinational circuit. 15. For two's complement numbers, the negative of a number can be found by adding one and then inverting the bits. 16. A disadvantage of two's complement numbers is that, unlike a sign-andmagnitude representation, you cannot tell if a number is negative by looking at only one bit. 17. The number of rows of a truth table depends on the number of inputs, not the number of outputs. 18. In the two's complement number representation, a negative number with more leading ones is larger (i.e. less negative) than a negative number with fewer leading ones