which number replaces the question mark and completes the puzzle ?
2 + 2 = 4
3 + 3 = 18
4 + 4 = 48
6 + 6= ?  Choose the correct option.
A) 135 B) 150 C) 185 D) 180 E) 190
180   180   2 + 2= 
<gadget id="calculator">2 + 2</gadget>
<output>4</output>
4 {2 * 2 * 1}   3 + 3= 18 {3 * 3 * 2}   4 + 4 = 48 {4 * 4 * 3}   6 + 6 = 180 {6 * 6 * 5}
<result>D</result>
which number replaces the question mark and completes the puzzle ?
2 + 2 = 4
3 + 3 = 18
4 + 4 = 48
6 + 6= ?