plss answer...this maths question...#macha..refer attachment
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plss answer...this maths question...#macha..refer attachment
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Correction to the question: It would be ' last ' and not 'past '
The three middlemost terms of this AP are 18 th, 19th and 20 th terms.
The sum of these terms is 225.
Hence,
a + 17d + a + 18d + a + 19d = 225
Hence,
a + 18d = 75...............[|]
The sum of the last three terms is 429.
35 th + 36th + 37th = 429
a + 34d + a + 35d + a + 36d = 429
Hence,
a + 35d = 143...............[||]
Solving these two equations, we get:
d = 4, a = 3.
Hence, the required AP is 3, 7, 11, 15, 19........147