Find the invalid no.from the following series 15, 16, 34, 105, 424, 2124, 12756	Choose the correct choice from the following answers
A) 16 B) 34 C) 105 D) 424 E) 2124
2nd term = (1st term) * 1 + 1 = 15 *1 + 1= 
<gadget id="calculator">15 *1 + 1</gadget>
<output>16</output>
16.   3rd term= (2nd term) * 2 + 2 = 16 * 2 + 2= 
<gadget id="calculator">16 * 2 + 2</gadget>
<output>34</output>
34   4th term= (3th term) *3 + 3 = 34 * 3 + 3= 
<gadget id="calculator">34 * 3 + 3</gadget>
<output>105</output>
105   5th term= (4th term) * 4 + 4 = 105 * 4 + 4= 
<gadget id="calculator">105 * 4 + 4</gadget>
<output>424</output>
424   6th term= (5th term) * 5 + 5 = 424 * 5 + 5= 
<gadget id="calculator">424 * 5 + 5</gadget>
<output>2_125</output>
2125   6th term should 2125 instead of 2124.   2124
<result>E</result>
Find the invalid no.from the following series 15, 16, 34, 105, 424, 2124, 12756