(a)[1]
The initial four terms of a sequence are $1, 3, 9, 27$. Find the next term in the sequence.
(b)[2]
The first five terms of another sequence are $35, 31, 27, 23, 19$. Find an expression, in terms of $n$, for the $n$th term of this sequence.
Mathematics 4024 · O Level · Sequences