Find the sum of all the 11 terms of an AP whose middle most term is 30

1.	Find the sum of all the 11 terms of an AP whose middle most term is 30
Answer» given n =11middle term = (a1 + a11)/2 = 30a1 + a11 = 60 .......... iSn = n/2(a1 + a11) ......... ii = 11/2 (60) ... from i = 11 x 30 = 330

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