Insert the missing number
5, -15, 45, -135, (....)
Options:
A) 350
B) -405
C) 405
D) -350
E) 0
5*-3=-15   -15*-3= 
<gadget id="calculator">-15*-3</gadget>
<output>45</output>
45   45*-3=-135   -135*-3= 
<gadget id="calculator">-135*-3</gadget>
<output>405</output>
405   ANSWER:405
<result>C</result>
Insert the missing number
5, -15, 45, -135, (....)