By grouping the terms in xyz - xy - z + 1, we get

(xy - z)(xy - 1)

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(z - 1) (xy + 1)

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(z + 1) (xy - 1)

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(z - 1) (xy - 1)

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Solution

The correct option is D
(z - 1) (xy - 1)

xyz - xy - z + 1 = xy (z - 1) -1 (z - 1)

= (z - 1) (xy - 1)

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Question 55 (ii)

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