Find the invalid no.from the following series 3, 8, 15, 31, 63, 127, 255
Pick
A) 11	B) 8	C) 27	D) 63	E) 127
Go on multiplying the number by 2 and adding 1 to it to get the next number.So, 8 is wrong.   8
<result>B</result>
Find the invalid no.from the following series 3, 8, 15, 31, 63, 127, 255