2007 AMC 12A Problems/Problem 7
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Problem
Let 
, and 
be five consecutive terms in an arithmetic sequence, and suppose that 
. Which of 
or can be found?
Solution
Let 
be the common difference between the terms.
, so 
. But we can't find any more variables, because we don't know what is. So the answer is 
.
See also
| 2007 AMC 12A (Problems • Resources) | ||
| Preceded by Problem 6 | Followed by Problem 8 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
