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

$10^{-1}$ $\left(\frac{1}{2}\right)^5$ $\left(\frac{9}{10}\right)^5$ $\frac{9}{10}$

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

The correct answer is Option (3) → $\left(\frac{9}{10}\right)^5$ P(Defective) = $\frac{1}{10}$ P(No Defective) = ${^5C}_5(\frac{9}{10})^5(\frac{1}{10})^0$ $=\left(\frac{9}{10}\right)^5$