Question

Find out a formula for the Nth term of each of the following sequences.

(i)4 7 10 13 16
(ii)1 3 5 7 9
(iii)20 17 14 11 8
(iv)1 4 9 16 25
(v)2 8 18 32 50

Answer 1

(i)4 7 10 13 16 N = 4 + (n-2)d
(ii)1 3 5 7 9 N = 2 + (n-1)d
(iii)20 17 14 11 8 N = 20 - (n-1)d
(iv)1 4 9 16 25 N = n^2
(v)2 8 18 32 50 N = 2n^2

Answer 2

i) term(n) = 3n +1
ii) term(n) = 2n - 1
iii) term(n) = -3n + 23
iv) term(n) = n^2
v) term(n) = 2(n^2)

Answer 3

Find the sum of each of the following
16-20 4+11+18+25......:s 10