Since each number is 2 less than the previous number, the formula that comes to mind immediately is -2n. However, since the first number is 2 instead of -2, an additional adjustment is required. This can be done by adding 4 to each term. The result is:4-2n
equivalent to:
2(2-n)
nth term = 2(2-n)
multiplies by 2
n - 1
t(n) = n(n - 3)
Un = 29 - 9n
This is the Fibonacci sequence, where the number is the sum of the two preceding numbers. The nth term is the (n-1)th term added to (n-2)th term
multiplies by 2
2(n-1)
If 3 is the first term, then the nth term is [ 3 x 2(n-1) ] .
n - 1
If 3 is the first term, then the nth term is [ 3 x 2(n-1) ] .
If the nth term is 8 -2n then the 1st four terms are 6, 4, 2, 0 and -32 is the 20th term number
t(n) = n(n - 3)
It is: nth term = -4n+14
Un = 29 - 9n
10 - 4n
This is the Fibonacci sequence, where the number is the sum of the two preceding numbers. The nth term is the (n-1)th term added to (n-2)th term
(n^2+n)/2