What is the maximum number of pieces that a circular pie can be divided into by four linear cuts? Choices
A) 6 B) 8 C) 9 D) 10 E) 11
Such kind of combinations problems are always about a pattern recognition.   Maximum pieces:   0 line gives 1 whole piece;   1 line will gives 2 pieces: 1+1= 
<gadget id="calculator">1+1</gadget>
<output>2</output>
2;   2 lines will give 4 pieces: 2+2= 
<gadget id="calculator">2+2</gadget>
<output>4</output>
4;   3 lines will give 7 pieces: 4+3= 
<gadget id="calculator">4+3</gadget>
<output>7</output>
7;   4 lines will give   7+4= 
<gadget id="calculator">  7+4</gadget>
<output>11</output>
11 pieces.   ANSW11R:11
<result>E</result>
What is the maximum number of pieces that a circular pie can be divided into by four linear cuts?