You need to determine the equation for the general term. That will depend on whether the sequence is additive, multiplicative, or something else. The generating equation will depend on the term's position and putting that equal to 20 will provide the answer.

Additive: 3, 5, 7 ,9 etc (each number is 2 more than the previous one).

Multiplicative: 2, 6, 18, 54, etc (each number is three times the previous one).

Fibonacci: 1, 1, 2, 3, 5, 8 etc (each term, after the first two, is the sum of the previous two).

There can be sequence generated by quadratic, cubic or any other functions so there is no simple way of answering this question.

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20th term = 20*(20+1)/2

Start out by finding the expression that describes the sequence. This is often in the form an + b. Example: Find the 20th term in the following sequence: 3 7 11 ... It appears that 4 is being added to the previous term to make the next term. However, instead of starting at 4, the sequence started at 3. The expression is: 4n - 1 Plug in the 20 to replace n, to give: 4*20 - 1= 79 Answer: The 20th term in the sequence is 79.

5n-1

The 90th term of the arithmetic sequence is 461

It is 60.

what term is formed by multiplying a term in a sequence by a fixed number to find the next term

a + 99d where 'a' is the first term of the sequence and 'd' is the common difference.

The 20th Fibonacci number in the sequence is 6,765.

The sequence is Un = 19 - 3n so the 20th term is 19 - 3*20 = 19 - 60 = -41

you must find the pattern of the sequence in order to find the next 50 terms using that pattern and the first part of the sequence given

If the sequence is non-linear, you need to establish how it is defined.

Find the formula of it.

If the nth term is 8 -2n then the 1st four terms are 6, 4, 2, 0 and -32 is the 20th term number

You first have to figure out some rule for the sequence. This can be quite tricky.

Increase of +220th term x 2 = 40(take away the first 4 terms)40 - (4 x 2) = 32By formula method:This is an arithmetic progression.First term is a = --6; common difference d = +2 the expected term n = 20By formula, tn = a + (n--1)dHence plugging, the required 20th term is --6 + 38 = 32

Three or more terms of a sequence are needed in order to find its nth term.

i dont get it

As can be seen, each succesive term is 2 greater than the last. We can write a rule to calculate the nth term. Here the rule equals 2n - 8. So the 20th term = (2 * 20) - 8 = 32.

From any term after the first, subtract the preceding term.

It is a sequence of numbers which is called an arithmetic, or linear, sequence.

It depends on how the sequence is defined. Whether it is increasing, decreasing, oscillating or whatever is not relevant.

Well, by definition a "random number sequence" is random; i.e. you cannot find out the next term.However if you're just trying to find the formula for a "number sequence" (not random):1) look at what you have to do to get from one number in the sequence to the next - example the initial difference between the numbers may give a sequence such as "+4, +6, +8, +10", this then gives a sequence of "+2, +2, +2 etc." - this does help to to find out the formula for the sequence.2) write down the "term numbers" (call this "t") above or below the sequance, (i.e. 1st term, 2nd term etc.) and see what you have to do to get from the term number to the sequence number. i.e "3t-1", "t squared minus 3" etc.

nth term Tn = arn-1 a = first term r = common factor

The difference between successive terms in an arithmetic sequence is a constant. Denote this by r. Suppose the first term is a. Then the nth term, of the sequence is given by t(n) = (a-r) + n*r or a + (n-1)*r

If the Fibonacci sequence is denoted by F(n), where n is the first term in the sequence then the following equation obtains for n = 0.