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56. The binary equivalent of the octal numbers 13.54 is
1011.1011
1101.1110
1000.1110
all of these
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57. The octal equivalent of 111 010 is
81
72
71
58. Consider excess-3 code that is used to represent integers 0 through 9 as shown below :
Number
Code ( a b c d )
0
1100
1
0010
2
1010
3
0110
4
1110
5
0001
6
1001
7
0101
8
1101
9
0011
Which of the following expressions is the correct one for an invalid code ?
b' . c' . d' + c . d
b' . c' . d' + a . c . d
b' . c' . d' + b . c . d + a . c . d + b' . c' . d'
b' . c' . d' + b . c . d + a . c . d
59. In 2's complement addition , overflow
is flagged whenever there is carry from sign bit addition
cannot occue when a positive value is added to a negative value
is flagged when the carries from sign bit and previous bit match
none of these
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