The following string number: 2.5.8.212, find the average of this string number

Answer: 107
2,5,8,…… , 212 is the arithmetic sequence with the first term of 2 and the tolerance of 3,
Therefore, the general formula an = 2 + (n-1) * 3
So 212 is 71,
Therefore, the sum of the first 71 terms of this arithmetic sequence is Sn = (2 + 212) * 71 / 2
Therefore, the average is Sn / 71 = (2 + 212) / 2 = 107

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