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In an A.P the difference between the 8th term and 4th term is 20 and the 8th term is 1half timesthe fourth term. what is the common difference and the first term of the sequence

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T8-T4 = 4d, so d=5

T8 = T4/2
(a+7d) = (a+3d)/2
a+35 = (a+15)/2
2a+70 = a+15
a = -55

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