It is an expression that can be simplified to: 3n-10
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It is n/2.
2 N cubed (3)
The numbers are 12, 14 and 16. Let the numbers by n - 2, n and n + 2, then (n - 2) + n + (n + 2) = 3n = 42 : n = 14 so n - 2 = 12 and n + 2 = 16.
-1
If n is even then number of palindromes is 2^(n/2). If n is odd then number of palindromes is 2*2^[(n-1)/2].