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Physics Chemistry

Entry Test MCQ :: Basic Algebra

  If a2-b2 = 21 and a2+b2=29 which of the following could be the value of ab? I- -10 II- 5?2 III- 10
[A]. I only[B]. II only
[C]. III only[D]. I and III only
[E]. II and III only    

Answer: Option D
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