Convert the following decimal numbers to octal:

(a) 19

(b) 122

(c) 161

(d) 0.675

Convert the following hexadecimal numbers to binary:

(a) A6

(b) A07

(c) 7AB4

Convert the following binary numbers to hexadecimal:

(a) 10011011101

(b) 1111011101011011

(c) 11010111010111

Convert the following binary numbers to hexadecimal:

(a) 1010110110111

(b) 10110111011011

(c) 0110101100