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Answer:ans is 23
We have,
(a + b)2 = a2 + b2 + 2ab
Substituting 1/a in place of b, we have
(a + 1/a)2 = a2 + 1/a2 + 2a(1/a) = a2 + 1/a2 + 2
⇒ 25 = a2 + 1/a2 + 2
⇒ a2 + 1/a2 = 25 - 2 = 23.
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