Convert the following octal numbers to binary:

(a) 7642

(b) 7015

(c) 3576

(d) 705

Add the following binary numbers:

(i) 10110111 and 1100101

(ii) 110101 and 101111

(iii) 110111.110 and 11011101.010

(iv) 1110.110 and 11010.011

Convert the following binary numbers to octal

(a) 11001

(b) 10101100

(c) 111010111

Convert the following octal numbers to binary:

(a) 123

(b) 3527

(c) 705