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818

Q:

$$ {ab-a-b+1}$$ का गुणनखण्ड है।

  • 1
    (a-1)(b-1)
  • 2
    (a+1)(b-1)
  • 3
    (a-1)(b+1)
  • 4
    (a+b)(b-1)
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Answer : 1. "(a-1)(b-1)"

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