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Question 3 (x)
In an AP:
(x) Given l = 28, S = 144 and there are total 9 terms. Find a.


Solution

(x) Given that, l = 28, S = 144 and there are total of 9 terms.
Sn=n2(a+l)144=92(a+28)(16)×(2)=a+2832=a+28a=4

Mathematics
NCERT Textbook
Standard X

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