15
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16 plus 10 plus 8 plus 6 plus 2 is equal to 42.
10 - 4n
2 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 = 106
The odd one out in the sequence 2, 4, 6, 8, 10, 12 is 10. The pattern in the sequence is that each number is increasing by 2, except for 10, which breaks the pattern. The other numbers in the sequence follow a consistent pattern of increasing by 2, making 10 the odd one out.
2 + 5 is 7 + 6 =13 + 7 = 20 + 8 = 28 + 9 = 37 + 10 is 47.