Question

0,6,20,42,72,? find?​

Answer 1

0 × 1 = 0

2 × 3 = 6

4 × 5 = 20

6 × 7 = 42

8 × 9 = 72

10 × 11 = 110

General form of the sequence is,

2(n - 1)(2n - 1)

= (2n - 1)(2n - 2)

= 4n² - 6n + 2