Encircle the odd one of the following.

$(- 1) \times (- 1)$

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$(- 1) \times (- 1) \times (- 1)$

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$(- 1) \times (- 1) \times (- 1) \times (- 1)$

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$(- 1) \times (- 1) \times (- 1) \times (- 1) \times (- 1) \times (- 1)$

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Solution

The correct option is B
$(- 1) \times (- 1) \times (- 1)$

Justification
$(a) (- 1) \times (- 1) = 1 (b) (- 1) \times (- 1) \times (- 1) = - 1 (c) (- 1) \times (- 1) \times (- 1) \times (- 1) = 1 (d) (- 1) \times (- 1) \times (- 1) \times (- 1) \times (- 1) \times (- 1) = 1 (b) (- 1) \times (- 1) \times (- 1) B u t, (- 1) \times (- 1) \times (- 1) = - 1$
Hence, $(- 1) \times (- 1) \times (- 1)$ is the odd one.

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