Which term of the ap 20 19 1 4
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Which term of AP 20,19 1\4,18 1\2... is first negative term
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AP series. Consists of rational numbers.
20, 19 1/4 , 18 1/2, .....
a = 20. d = -3/4.
n'th term = Tn = 20 - 3/4 * (n - 1)
Tn < 0. means that n - 1 > 4*20/3.
So n > 1 + 80/3
So n = 28.
T_28 = 20 - 27 * 3/4 = - 1/4.
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