What would be the missing number in the series: 1, 20, 266, 675,?	Choices:  A) 76  B) 78  C) 80  D) 82  E) 84
1,20,x,266,675   &gt; 20-1,x-20,266-x,675-266.   &gt;again doing the same upto   &gt;325-3x, -143+3x.   &gt;we get 6x-486 equate it with zero.   &gt; 6x-486 = 0   &gt;x = 78.   ANSWER:78
<result>B</result>
What would be the missing number in the series: 1, 20, 266, 675,?