the 10th and 12th terms of an arithmetic sequence are 11 and 14 respectively, a. what is d? b. whatbis a1? c. what is a100?
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The first term is a1, the common difference is d, and the number of terms is n. The sum of an arithmetic series is found by multiplying the number of terms times the average of the first and last terms. ... To find n, use the explicit formula for an arithmetic sequence. We solve 3 + (n – 1)·4 = 99 to get n = 25.
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