A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
20, 400, 22, 484, 24, 576, ?

The series is composed of alternate numbers and their corresponding squares:
1st term = 20

2nd term = 20
2
=400

3rd term = 20+2=22

4th term = 22
2
=484

5th term = 22+2=24

6th term = 24
2
=576

Following this alternate logic, the 7th term must be:

24+2=26