Answer
$P(both~chips~are~defective)=\frac{1}{40,000}=0.000025$
The result, assuming independence, ($0.000025$) is very close to the exact result ($0.00002450$)
Work Step by Step
Assuming independence:
$P(first~chip~is~defective)=P(second~chip~is~defective)=\frac{1}{200}$
Using the Multiplication Rule for Independent Events (page 282):
$P(both~chips~are~defective)=P(first~chip~is~defective)\times P(second~chip~is~defective)=\frac{1}{200}\times\frac{1}{200}=\frac{1}{40,000}=0.000025$
The result, assuming independence, ($0.000025$) is very close to the exact result ($0.00002450$)
