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Octal subtraction of (232)8 from (417)8 will give ______________

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Octal subtraction of (232)8 from (417)8 will give  ______________

(a) 165

(b) 185

(c) 815

(d) 516

I got this question during an online interview.

My question comes from The Octal Number System in portion Number Systems of Computer Fundamentals

1 Answer

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Best answer
Right choice is (a) 165

Easy explanation: Octal subtraction is done as follows:

    417

–   232

________

    165

The octal subtraction is the same as that of any other number system. The only difference is, like in a decimal number system, we borrow a group of 10, in a binary system we borrow a group of 2, in an octal number system, we borrow in groups of 8.

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