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(1+26+2⋅56⋅12+2⋅5⋅86⋅12⋅18+⋯ )3= ?\left(1+\dfrac {2}{6}+\dfrac {2\cdot5}{6\cdot12}+\dfrac {2\cdot5\cdot8}{6\cdot12\cdot18}+\cdots\right)^3 = \ ?(1+62+6⋅122⋅5+6⋅12⋅182⋅5⋅8+⋯)3= ?
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