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How do you find the term n=81, given the arithmetic sequence #a_1=20# and d=4?

1 Answer

Shwetank Mauria

Nov 4, 2016

#81^(st)# term of the arithmetic sequence is #340#.

Explanation:

#n^(th)# term of an arithmetic sequence, whose first term is #a_1# and common difference is #d# is

#a_1+(n-1)xxd#

As we have #a_1=20# and common difference is #d=4#

#81^(st)# term of the arithmetic sequence is

#20+(81-1)xx4=20+80xx4=20+320=340#

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