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14+24×7+34×7×10+44×7×10×13+⋯=1a\frac 14 + \frac 2{4 \times 7} + \frac 3{4 \times 7 \times 10} + \frac 4{4 \times 7 \times 10 \times 13} + \cdots = \frac 1a 41+4×72+4×7×103+4×7×10×134+⋯=a1
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