if the sum of first 7 terms of ap is 49 and that of 17 terms is289, find Sum of first n term
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hey sakna here
a7 = 49
a17 = 289
a + 7d = 49
a+ 17d = 289
-10d = -240
d = 24
a + 7d =49
a + 7 (24) = 49
a+ 168 = 49
a = 49 - 168
a= -119
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