2 common difference
1 3 5 7 9
1 + 2 = 3
3 + 2 = 5
5 + 2 = 7
7 + 2 = 9
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The common difference is the difference between two numbers in an arithmetic sequence.
arithmetic sequence
a + 99d where 'a' is the first term of the sequence and 'd' is the common difference.
You subtract any two adjacent numbers in the sequence. For example, in the sequence (1, 4, 7, 10, ...), you can subtract 4 - 1, or 7 - 4, or 10 - 7; in any case you will get 3, which is the common difference.