12,21,48,87,__
Pick.
A) 176  B) 186  C) 184  D) 174  E) 164
21=12*2-3   48=21*2+6   87=48*2-9   so next number is 87*2+12= 
<gadget id="calculator">87*2+12</gadget>
<output>186</output>
186   ANSWER:186
<result>B</result>
12,21,48,87,__