from progress if 10th term of an A.P is 15 and 15th term is 10, then 4th term is
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a+9d = 15
a = 15-9d
a+14d = 10
put the value of a.
a + 14d = 10
(15-9) + 14d = 10
210d - 126d = 10
a = 15-9d
a+14d = 10
put the value of a.
a + 14d = 10
(15-9) + 14d = 10
210d - 126d = 10
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