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The fifth term of an arithmetic sequence is equal to 6 and the sum of the first 12 terms is equal to 45. Find the first term and the common difference.

2 answers

just crank it out using the formulas you already know:

a+5d = 6
12/2 (2a+11d) = 45

oops - that's a+4d=6

But I'm sure you caught that...

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