In a box containing 100 bulbs, 10 are defective. The probability; that out of a sample of 5 bulbs none is defective is :
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → $\left(\frac{9}{10}\right)^5$
P(Defective) = $\frac{1}{10}$
P(No Defective) = ${^5C}_5(\frac{9}{10})^5(\frac{1}{10})^0$
$=\left(\frac{9}{10}\right)^5$