The 6th term in the following series ab² + bc² + cd² + de² + ...... is

Which term is wrong in the following series? 8, 13, 21, 32, 47, 63, 83

8th term of the following series will be : 2, 6, 18, 54, ...

Find the next term in the following number series : 2, 7, 24, 77, 238, ……..

The missing number (?) in the following series is : 3, 7, 15, 31, 63, ?

Next term in the following sequence is: 2, 12, 36, 80, 150, ?