If a1=12×5,a2=15×8,a3=18×11,...,a_{1}=\frac{1}{2\times5},a_{2}=\frac{1}{5\times8},a_{3}=\frac{1}{8\times11},...,a1=2×51,a2=5×81,a3=8×111,..., then a1+a2+a3+...+a100a_{1}+a_{2}+a_{3}+...+a_{100}a1+a2+a3+...+a100 is
25151\frac{25}{151}15125
12\frac{1}{2}21
14\frac{1}{4}41
11155\frac{111}{55}55111
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