A natural number x is chosen at random from the first 100 natural numbers. What is the probability that x2 + x > 50?

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NDA-II 2024 (Maths) Official Paper (Held On: 01 Sept, 2024)
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  1. 93/100
  2. 47/50
  3. 24/25
  4. 23/25

Answer (Detailed Solution Below)

Option 2 : 47/50
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Detailed Solution

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Explanation:

⇒n(S) = 100 

Numbers from 7 to 100 satisfy x+ x > 50

Then, n(E)= 100 – 6 = 94

⇒ 

∴ Option (b) is correct

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