Convert the following octal numbers to binary:

(a) 7642

(b) 7015

(c) 3576

(d) 705

Convert the following binary numbers to octal

(a) 11001

(b) 10101100

(c) 111010111

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 octal numbers to binary:

(a) 123

(b) 3527

(c) 705