Find an AP whose 10th term is -28 and the 20th term is 12
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a+9d=-28
a+19d=12
by solving these equations, we get
a=-64,d=4.AP is -64,-60, -56....
a+19d=12
by solving these equations, we get
a=-64,d=4.AP is -64,-60, -56....
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