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the first three terms of a sequence are given round to the nearest thousandth(if necessary). 413,405,397,...Find the 48th term

1 Answer

4 votes

37

1) Examining the sequence we can notice that

413-405 = 8

405 -397 =8

So, this is an Arithmetic Sequence whose common difference is -8

2) Therefore, we can write one Explicit Formula so that we can find out the 48th term


\begin{gathered} a_n=a_1+(n-1)d \\ a_(48)=413+(48-1)(-8) \\ a_(48)=413\text{ +47(-8)} \\ a_(48)=413+(-376) \\ a_(48)=413-376\text{ =37} \end{gathered}

3) Hence, the 48th term of that Arithmetic Sequence is 37

User Damp
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