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CUET · MATHS · PYQ PAPER 2023

In a box containing 100 bulbs, 10 are defective.
The probability that out of a sample of 5 bulbs none is defective is:

  1. A \(10^{-1}\)
  2. B \(\left(\frac{1}{2}\right)^5\)
  3. C \(\left(\frac{9}{10}\right)^5\)
  4. D \(\frac{9}{10}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\left(\frac{9}{10}\right)^5\)

Step-by-step Solution

Detailed explanation

Non-defective bulbs = \(100 - 10 = 90\) Probability of one non-defective bulb = \(\frac{90}{100} = \frac{9}{10}\) Probability of 5 non-defective bulbs = \(\left(\frac{9}{10}\right)^5\)
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