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<b><math>1, 4, 7, 10, 13, 16, 19, . . .</math></b><br>
share a common difference of <math>3</math>.<br>
Note: The three dots (. . .) mean that this sequence is infinite.<br><br>
Though others can also be used, the following variables are typically used to represent the terms of an arithmetic sequence:<br>
<math>a_1</math> represents the first term of the sequence. In the example above, <math>a_1=1</math><br>
<math>a_n</math> represents the nth term (a term we are trying to find).<br>
<math>d</math> represents the common difference between consecutive terms. In the example above, <math>d=3</math><br>
<math>n</math> represents the number of terms in the sequence. In the example above, <math>n=7</math><br><br>
The standard form of arithmetic sequences can be expressed as:
<math>a, a+d, a+2d, a+3d, a+4d, a+5d . . .</math><br>
<math>a</math> represents the first term and is sometimes written as <math>a_1</math>.<br>
<math>d</math> represents the common difference.<br><br>
<b>Formulas</b><br><br>
<b>Finding any term (<math>a_n</math>) in an arithmetic sequence:</b><br>
<b><math>a_n=a+d(n-1)</math></b><br><br>
<math>a\:</math> represents the first term.<br>
<math>d\:</math> represents the common difference.<br>
<math>n\:</math> represents the position of a term in the sequence.<br>
A sequence with <math>\:n\:</math> number of terms would be written as:<br>
<math>a, a+d(2-1), a+d(3-1), a+d(4-1), a+d(5-1), a+d(6-1) ... a+d(n-1)</math><br>
in which the last term's common difference is multiplied by <math>\:n-1\:</math> (because <math>\:d\:</math> is not used in the 1st term).<br><br>
Example: To find the next term in:<br>
<math>1, 4, 7, 10, 13, 16, 19...</math><br>
which would be the 8th term, we would plug the following into the general term formula <math>\:a_n= a+d(n-1)</math>:<br>
<math>a\:</math> (first term) <math> =1</math><br>
<math>d\:</math> (common difference) <math> =3</math><br>
<math>n\:</math> (term number) <math> =8</math><br>
This would give us:<br>
<math>a_8=1+3(8-1)\:</math> which we could solve to get <math>\:a_8=22</math>.<br>
So, our sequence would be: <math>\:1, 4, 7, 10, 13, 16, 19, 22...</math><br><br>
<b>Finding the sum of all the terms in an arithmetic sequence:</b><br>
<b><math>s=n(a_1+a_n)/2</math></b><br><br>
<math>s\:</math> is the sum of the terms in the sequence.<br>
<math>a\:</math> represents the first term.<br>
<math>n\:</math> represents the position of a term in the sequence.<br>
<math>d\:</math> represents the common difference.<br>
Example: To find the sum of:<br>
<math>1, 4, 7, 10, 13, 16, 19...\:</math> we plug the following into the sum formula <math>\:s=n(a_1+a_n)/2</math> :<br>
<math>n\:</math> (total number of terms)<math> =7</math><br>
<math>a\:</math> (first term)<math> =1</math><br>
<math>a_n\:</math> (the last term)<math> =19</math><br>
This would give us:<br>
<math>s=7(1+19)/2\:</math> which we could solve to get <math>\:s=70</math>.<br>
So, the sum of the sequence would be: <math>\:70</math><br>
Tiger identifies arithmetic sequences and displays their terms, the sum of their terms, and their explicit and recursive forms.
<b>a1</b> predstavlja prvi član niza<br>
<b>an</b> predstavlja n-ti član (član koji pokušavamo da nađemo)<br>
<b>d</b> predstavlja zajedničku razliku između uzastopnih članova<br>
<b>n</b> predstavlja broj članova u nizu.<br><br>Tiger identifikuje aritmetičke nizove i prikazuje njihove članove, zbir njihovih članova i njihove eksplicitne i rekurzivne oblike.