Question

Write down in terms of n, an expression for the nth term of the following sequences: 12,10,8,6,4

Answer 1

The common difference is -2, so the formula for the nth term is 12-2(n-1).

This can be written 12-2n+2=14-2n, so that when n=1, the 1st term is 14-2=12.

The 5th term is 14-10=4; the 6th is 14-12=2. And so on

Explanation: