Insert the missing number.
8, 7, 16, 5, 24, 3, 32, 1, 40,-1, (....)	Choose the correct option.
A) 48 B) 40 C) 35 D) -3 E) -4
Explanation:   There are two series, beginning respectively with 8 and 7. In one 8 is added and in another 2 is subtracted.   The next number is  40 + 8= 
<gadget id="calculator"> 40 + 8</gadget>
<output>48</output>
48.   48nswer: 48) 48
<result>A</result>
Insert the missing number.
8, 7, 16, 5, 24, 3, 32, 1, 40,-1, (....)