1MA0 Higher June 2014 Paper 2 Q12

EdexcelHigherOld spec3 marksSequences

12 Here are the first five terms of an arithmetic sequence.

4 9 14 19 24

(a) Find, in terms of \(n\), an expression for the \(n\)th term of this sequence. (2)

Here are the first five terms of a different sequence.

2 2 0 \(-4\) \(-10\)

An expression for the \(n\)th term of this sequence is \(3n - n^2\)

(b) Write down, in terms of \(n\), an expression for the \(n\)th term of a sequence whose first five terms are
4 4 0 \(-8\) \(-20\) (1)