The pattern decreases by 2 each step.<br><br>
&bull; 19 &minus; 2 = 17<br>
&bull; 17 &minus; 2 = 15<br>
&bull; 15 &minus; 2 = 13 &rarr; first missing number<br>
&bull; 13 &minus; 2 = 11<br>
&bull; 11 &minus; 2 = 9<br>
&bull; 9 &minus; 2 = 7 &rarr; second missing number<br><br>
Final Answer: 13, 7