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Why

Shreya dhaker - about 8 years ago

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Option 2 and 3 r same

Saawan - about 8 years ago

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what does this question mean?

Kavita bharati - about 8 years ago

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why?

Kavita bharati - about 8 years ago

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why??

Kavita bharati - about 8 years ago

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Why the negative sign is used?

Abhilash nanda - about 8 years ago