Find the next number in the series 1, 3 ,7 ,13 ,21 ,31  Pick: A) 43 B) 33 C) 41 D) 45 E) 51
3-1= 
<gadget id="calculator">3-1</gadget>
<output>2</output>
2   7-3= 
<gadget id="calculator">7-3</gadget>
<output>4</output>
4   13-7= 
<gadget id="calculator">13-7</gadget>
<output>6</output>
6   21-13= 
<gadget id="calculator">21-13</gadget>
<output>8</output>
8   31-21= 
<gadget id="calculator">31-21</gadget>
<output>10</output>
10   so the next number is  31+12= 
<gadget id="calculator"> 31+12</gadget>
<output>43</output>
43   43NSWER:43
<result>A</result>
Find the next number in the series 1, 3 ,7 ,13 ,21 ,31