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hemant balde Grade:
        

5 times the 5th term is 8 times the 8th term find its 12th term

6 years ago

Answers : (1)

Sudheesh Singanamalla
114 Points
										

5th term of AP = a+4d


8th term of AP = a+7d


5* (a+4d) = 8 * (a+7d)


5a + 20d = 8a + 56d


-3a = 36d


d = -a/12


12th term = a+ 11d


==> a + 11* -a / 12


==> ( 12a - 11a )/ 12


==> a/12


 


therfore the 12th term is a/12

6 years ago
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