Find the Probability of One Event and a Second Event $\frac { 1 } { 400 }$

Multiple Choice

Find the Probability of One Event and a Second Event Occurring
-An urn contains balls numbered 1 through 20. A ball is chosen, returned to the urn, and a second ball is chosen. What is the probability that the first and second balls will be a 7?

A) $\frac { 1 } { 400 }$
B) $\frac { 1 } { 10 }$
C) $\frac { 7 } { 20 }$
D) $\frac { 7 } { 40 }$