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The arithmetic sequence 2,6,10

The last term of the sequence is 90, what is the the number of terms in the sequence?

Please explain how to work out this question, I'm stuck

Thank you
Ur=a+(r-1)d

d= common difference
a= 1st term
r= the term of the sequence

you know that Ur=90 so to find r sub in your other values and solve for r

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Last updated: April 18, 2012
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