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199 . For (a+b) =7 and ab = 12, (a-b) =?

  • A. 1
  • B. 2
  • C. 3
  • D. 4
  • E. None of them
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200 . a+b=9m এবং ab=18m2 হলে, a-b=?

  • A. 3m
  • B. -3m
  • C. 6m
  • D. 8m
  • E. a এবং b উভয়ে
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201 . If a2 +b2 = 45 and ab= 18 , find 1/a +1/b.

  • A. 1/3
  • B. 2/3
  • C. 1/2
  • D. can not be determined
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