Quantitative Aptitude Progression Arithmetic Progression

The arithmetic mean of data with observations a, a + d, a + 2d, ....., a + 2md is 

1
a + md
2
a + (m - 1)d
3
\(\rm a +\frac{1}{2}md\)
4
\(\rm a +\frac{1}{2}(m+1)d\)

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