What will complete the sequence?2, 6, 12, ?, 30

The correct answer is Option (2) → 20

The differences between the terms are 4, 6, ... and rise by 2 each time. Each term is the product of two consecutive numbers, \(n(n+1)\):

• \(2=1\times2\), \(6=2\times3\), \(12=3\times4\)

• Missing term \(=4\times5=20\)

• Next term \(5\times6=30\), as given