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1.17 Add, subtract, and multiply in binary: (a) 1111 and 1001 (b) 1101001 and 110110 (c) 110010 and 11101 1.19 Divide in binary: (a) 11101001 101 (b) 110000001 1110 (c) 1110010 1001 Check your answers by multiplying out in binary and adding the remainder. 1.20 Divide in binary: (a) 10001101 +110 (b) 110000011 1011 (c) 1110100 1010