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Which product is negative

Which product is negative-example-1

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One thing for sure it is not b,d,c its a

User Tura
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1st one -*- =+,+*- = -,-*- = +

2nd one = 0

3rd one-*-=+,+*+=+,+*+=+

4th one +*-=-,-*-=+,+*- = -

4th one is negative

User Torbenrudgaard
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