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Mathematics 21 Online
OpenStudy (anonymous):

Find the 90th term in the sequence 1,-2,-5

OpenStudy (anonymous):

Here first term is a = 1 difference d = -3

OpenStudy (anonymous):

Ohhh use Sn = n/2(a + (n-1)d) to find the nth term...

OpenStudy (anonymous):

Getting this ???

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