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Find the sign of the product if we multi...

Find the sign of the product if we multiply:
i. `2m+1` times (-1) where m is a natural number.
ii. 2n positive numbers and 2m+1 negative numbers
iii. 2n+1 positive numbers and 2m negative numbers

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The correct Answer is:
i. (-1) ii. negative iii. Positive
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