What Is the nth term of the number sequence 15 12 9 6?

Answer 1

According to Wittgenstein's Finite Rule Paradox every finite sequence of numbers can be a described in infinitely many ways and so can be continued any of these ways - some simple, some complicated but all equally valid. Conversely, it is possible to find a rule such that any number of your choice can be the next one.

The simplest rule is un = 18 - 3n

Answer 2

Each term is derived from previous term by subtracting 3, so the sequence is 15 12 9 6 3 0 etc

15 is 1st term

12 is 2nd term and 12 = 15 - 3(1)

9 is 3rd term and 9 = 15 - 3(2)

6 is 4th term and 6 = 15 - 3(3)

so the Nth term is 15 - 3(N-1)

eg if N=6 then the 6th term is 15 - 3(5) = 15 - 15 = 0

Answer 3

Well, honey, it looks like you've got yourself a sequence where each number is decreasing by 3. So, if you want the nth term, you just need to multiply n by -3 and add 18. In simple terms, the nth term of the sequence is -3n + 18.

Answer 4

3

Answer 5

3

Answer 6

I'm seeing a lot of confused, uneducated answers. Here's the answer you want:

-3n + 18

or

-3(n - 1) + 15

To find the formula for an arithmetic sequence/series, use the formula d(n-1) + a, where d is the common difference (in this case, each term is 3 LOWER than the last, so d=-3) and a is the first term in the sequence (in this case, a = 15)

This gives us -3(n - 1) + 15

= -3n + 3 + 15

= -3n + 18

Answer 7

3n-3

Answer 8

8

Answer 9

n-15

Answer 10

3 0 -3