Question

Write down in terms of n, an expression for the nth term

of the following sequences:
ET
a) 2 5 8 11 14
b) 9 11 13 15 17​

Answer 1

In bold below.

Explanation:

a) Arithmetic sequence with common difference 3 and first term = 2:

nth term = 2 + 3(n - 1)

= 3n -1.

b) Similar to above with common difference 2 and first term = 9.

nth term = 9 + 2(n - 1)

= 2n + 7.