Find the invalid no.from the following series 3, 6, 15, 31, 63, 127, 255	Choose the most appropriate option:
A) 6
B) 7
C) 27
D) 63
E) 127
Go on multiplying the number by 2 and adding 1 to it to get the next number.So, 6 is wrong.   6
<result>A</result>
Find the invalid no.from the following series 3, 6, 15, 31, 63, 127, 255