What beofan to happen
When the the book fell down
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f(1) = 1 and f(n) = f(n-1) + 2(n -1 )
Check: f(2) = 1 + 2 = 3, f(3) = (1+2) + 4 = 7, etc.
Therefore, f(n) = 1 + 2 + 4 + ... + 2 (n-1) =
1 + 2 (1 + 2 + 3 + ... + n-1) = 2 (n-1)(n)/2 = 1 + (n-1)n.
Check: f(6) = 31, f(7) = 43, and f(8) = 57,
also the number of products made by Heinz.
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