(a) (742)8 is already in octal representation. So, we will change it to its Decimal, Hexadecimal and Binary form.
To Decimal
(742)8=7×82+4×81+2×80(742)8=448+32+2=48210.
To Hexadecimal form
16161648230 r 21 r E0 r 1
(742)8=1E216
To Binary form
222222222482241 r 0120 r 160 r 030 r 015 r 07 r 13 r 11 r 10 r 1
(742)8=1111000102
(b) (1011)2 is already in binary representation. So, we will change it to its Decimal, Hexadecimal and Octal form.
To Decimal
(1011)2=1×23+0×22+1×21+1×20(1011)2=8+4+1=1310.
To Hexadecimal form
1616130 r D
(1011)2=D16
To Octal form
88131 r 50 r 1
(1011)2=158
(c) (42)10 is already in decimal representation. So, we will change it to its binary, Hexadecimal and Octal form.
To binary
2222224221 r 010 r 15 r 02 r 11 r 00 r 1
(42)10=1010102
To Hexadecimal form
1616422 r A0 r 2
(42)10=2A16
To Octal form
88425 r 20 r 5
(42)10=528
(d) (3EAC)16 is already in Hexadecimal representation. So, we will change it to its binary, decimal and Octal form.
To decimal
(3EAC)16=3×163+E×162+A×161+C×160(3EAC)16=12288+3584+160+12=1604410.
To Binary form
(3EAC)16=111110101011002
To Octal form
(3EAC)16=372548
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