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1. a-1a=5

  • A. 20
  • B. 20
  • C. 20
  • D. 20

Answer: Option D

Explanation:

দেওয়া আছে, a + 1/a = 5

প্রদত্ত রাশি, a2 + 1/a2 = ( a - 1/a)2 + 2.a.1/a

= ( 5)2 + 2 = 25 + 2 = 27

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