Do-it-in-your-head method: The middle number MUST be a third of the total so 138 divided by 3 is 46, making your three numbers 44, 46 and 48. Shazam!
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The integers are 44, 46 and 48.
The simplest way is to solve 4n + 6 = 138 for the smallest of them.
The numbers are 45, 46 and 47.
The sets are 277, 279 and 136, 138, 140, 142.
138 is an even number.Any numbers that end with; 0, 2, 4, 6, or 8 are considered an 'Even' number.