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A) 7's compliment of (400)7

B) 9's compliment of (36800)9

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A) 7's compliment of (400)7

first find 6's compliment

666 - 400 = 266

then to find 7's compliment add 1

266 + 1 =300

B) 9's compliment of (36800)9

find 8's compliment

88888 - 36800 = 52088

then add 1

=52100

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