Question

find the sequence of
6,12,18,24______
but nth or general rule​

Answer 1

Each term in the sequence is got by doubling the previous term. So to define the recurrence relation, we give the first term, written U1 = 2. Then we write: Un = 2(Un-1). This just means that the nth term, Un is equal to 2 × the (n-1)th term, Un-1.

Answer 2

12+6= 18. 18+6=24. 24+6= 30.