Question

what is the nth term to 18 11 4 -3 -10

Answer 1

This is an Arithmetic sequence.

18,11,4,-3,-10.......................n

Now do you see the pattern.

It REDUCES BY 7
So common difference = -7
First term = 18

n = ?

An = a + (n-1)d
= 18 + (n-1)*-7
= 18 - 7n + 7
= -7n + 25

This will give you the value of ANY term 'n' in the sequence!

Got it? :)