7th term of an arithmetic sequence is 17 and 17th term is 7
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a+6d=17
a+16d=7
a+16d-a-6d=7-17
d=-1=common difference
a-6=17 so a=23
24th term=a+23d=23-23=0
S47=47/2(2a+46d)=47/2(46-46)=0
S48=48/2(2a+47d)=24(46-47)=-24
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The seventh, third and first terms of an arithmetic sequence form the first three terms of a geometric sequence. ... The seventh term of the arithmetic sequence is 3.
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