Insert the missing number
17, 7, 24, 19, 9, 28, ..., 8, 31	Choose the most appropriate option.
A) 20
B) 21
C) 18
D) 23
E) 25
17+7= 
<gadget id="calculator">17+7</gadget>
<output>24</output>
24   19+9= 
<gadget id="calculator">19+9</gadget>
<output>28</output>
28   x+8=31   therefore x=23   ANSWER:23
<result>D</result>
Insert the missing number
17, 7, 24, 19, 9, 28, ..., 8, 31