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A comment on Many elementary teachers don’t understand math, and it makes them anxious. Parent comment
I solved the problem for n, the largest number in the sequence of eleven, and a, the number Maria erases, by the following:
n - 11 < a < n + 1
11(n + n - 10)/2 = 2012 + a
I’m interested to know what other methods may be used to solve it (apart from brute force).
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I solved the problem for n, the largest number in the sequence of eleven, and a, the number Maria erases, by the following:
n - 11 < a < n + 1
11(n + n - 10)/2 = 2012 + a
I’m interested to know what other methods may be used to solve it (apart from brute force).