the sum of first fifteen terms of ap is 105 and sum of the next fifteen term is 780.find the first three terms of the ap
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Answer: The first three terms are -14,-11,-8
Step-by-step explanation:
Here, 15 a + 105 d = 105 and 15 a + 330 d = 780
225 d = 675
d = 3
15 a + 315 = 105
a = -14
a + d = -11
a+ 2d = - 11 + 3= - 8
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