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Is −21 a term of the arithmetic sequence having t1=90, t3=81?
5 years ago

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oobleck
every odd-numbered term is a multiple of 9, so no.
you can do the math, noting that d = -9/2, so you want n such that

90 - 9/2 n = -21
You will find that n is not an integer
5 years ago

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