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Answers ( 1 )
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    \(\dfrac{1}{1.2.3}+\dfrac{1}{2.3.4}+...+\dfrac{1}{a.\left(a+1\right).\left(a+2\right)}=\dfrac{a.\left(a+3\right)}{4.\left(a+1\right)\left(a+2\right)}\)

    Can you for me!yeu

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