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IX = 9 IXX = 19 IX times IXX = -I(-I+XX)+X(-I+XX) Removing brackets = +I-XX-X+CC Collecting like terms = -XXX+CC+I When simplified = CLXXI (171) Please note: Remember that in maths a minus number multiplied by a minus number becomes a positive number. Thus -I times -I = I David Gambell, Merseyside, England.

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16y ago

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