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31. If (x567)8+(12yx 5)8=(71yx)8, then values of x and y are
4, 4
3, 3
4, 3
None of these
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32. Which of the following is the binary representation of the hexadecimal number 3B7F?
0100 1001 1110 1101
0011 1011 0111 1111
1111 1011 0111 1001
0010 0100 0000 1010
33. In 2's complement representation, a certain negative number -N is 1011. The representation of +N is
0100
0101
0110
1111
34. The expression for sum of A, B in the half adder is given by
AB
A + B
A ⊕ B
35. Which of the following is true about BCD ?
It is a 8-4-2-1 weighted code
(1234567)10 needs 4 bytes in BCD representation
Conversion to and from the decimal system can be done easily
All of these
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