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The 3rd term and the 13th term of an arithmetic sequence are -40 and 0 respectively. What is the 28th term of the sequence?

2 answers

there are ten common differences between the 3rd term and the 13th term

the common difference is ... (0 - -40) / 10 = 4

there are 15 common differences between the 13th term and the 28th term
the 8th h term of a geometric sequence are -21 and -189 respectively.what is the 3rd term of the sequence ?
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