If you mean: 6 12 18 24 then the nth term is 6n
The nth term of that series is (24 - 6n).
The nth term in the arithmetic progression 10, 17, 25, 31, 38... will be equal to 7n + 3.
7n - 4
Give the simple formula for the nth term of the following arithmetic sequence. Your answer will be of the form an + b.12, 16, 20, 24, 28, ...
The nth term is 7n-4 and so the next number in the sequence is 31
For {12, 15, 18} each term is the previous term plus 3; a general formula for the nth term is given by t(n) = 3n + 9. For {12, 24, 36} each term is the previous term plus 12; a general formula for the nth term is given by t(n) = 12n.
If 3 is the first term, then the nth term is [ 3 x 2(n-1) ] .
The nth term is (36 - 4n)
If 3 is the first term, then the nth term is [ 3 x 2(n-1) ] .
You can see that all the numbers go up by 7. This means that the first part of the nth term rule for this sequence is 7n. Now, you have to find out how to get from 7 to 3, 14 to 10, 21 to 17 ... this is because we are going up in the 7 times table. To get from the seventh times table to the sequence, you take away four. So the answer is : 7n-4
2n(n+1)