1. (show the full calculations)
(a). the n^th term of a sequence is n(n+1)
(i) write the two missing terms in the spaces.
2, 6, 20,
(ii) write down an expression in terms of n for the 〖(n+1)〗^th term.

(iii) the difference between the n^th term and the 〖(n+1)〗^th term is pn+q.
find the values of p and q.
(iv) find the positions of the two consecutive terms which have a difference of 140
and