Find the odd man out
3, 7, 15, 27, 63, 127, 255 Choose the correct answer:
A) 7  B) 15  C) 27  D) 63  E) 54
1*2+1= 
<gadget id="calculator">1*2+1</gadget>
<output>3</output>
3   3*2+1= 
<gadget id="calculator">3*2+1</gadget>
<output>7</output>
7   7*2+1= 
<gadget id="calculator">7*2+1</gadget>
<output>15</output>
15   15*2+1= 
<gadget id="calculator">15*2+1</gadget>
<output>31</output>
31   31*2+1= 
<gadget id="calculator">31*2+1</gadget>
<output>63</output>
63   63*2+1= 
<gadget id="calculator">63*2+1</gadget>
<output>127</output>
127   127*2+1= 
<gadget id="calculator">127*2+1</gadget>
<output>255</output>
255   ANSWER:27
<result>C</result>
Find the odd man out
3, 7, 15, 27, 63, 127, 255