what is the best solution for arithmetic progressions of class 10 .Give the best and easy solution for exercise 5.3 questions In an AP(x) Given l = 28, S = 144 and there are total 9 terms. Find a.
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In an AP(x) Given l = 28, S = 144 and there are total 9 terms. Find a. Q.3(10)
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Given that, l = 28,S = 144 and there are total of 9 terms.
Sum of n terms formula,
Sn = n/2 (a + l)
144 = 9/2(a+28)
(16)×(2) = a+28
32 = a+28
a = 4