Question

Use the pattern to answer the question. 27, 18, 12, 8. Which expression can be used to find the nth term of the pattern?

A. 27-6n
B. 27-6(n-1)
C. 27(2/3)^n
D. 27(2/3)^n-1

Answer 1

If you cross check with the answer , you’ll find option C to be the most appropriate option.

The difference between the first two terms is 9 and 9 is not a multiple of six, therefore first two are wrong.

Similarly, if you check option D for the first two terms , you get the second term as 27 which is false.

Therefore option C is the answer, also , it satisfies the series.