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Carry out BCD subtraction for (68) – (61) using 10’s complement method.

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Carry out BCD subtraction for (68) – (61) using 10’s complement method.

(a) 00000111

(b) 01110000

(c) 100000111

(d) 011111000

This question was addressed to me during an online exam.

This interesting question is from Binary Coded Decimal(BCD) in division Number System and Codes of Digital Circuits

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Right option is (a) 00000111

Easiest explanation: First the two numbers are converted into their respective BCD form using 8421 sequence. Then binary subtraction is carried out.

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