What is the formula for the general term (nth term) of an arithmetic sequence whose first term is a and common difference is d?, T_n = a + n(d - 1), T_n = a + (n - 1)d, T_n = a + nd, T_n = (a + d)^{n-1}, According to the remarks, to find the order of the first negative term in an arithmetic sequence, what condition must be applied?, T_n > 0, T_n = 0, T_n < 0, T_n < x, If T_3 = 11 and T_6 = 20 in an arithmetic sequence, what is the value of the common difference d?, d = 3, d = 2, d = 4, d = 9

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