# How do you use sigma notation to write the sum for #1/(1*3)+1/(2*4)+1/(3*5)+...+1/(10*12)#?

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I give the sum here.

As a matter of interest, I perform summation.

So, the sum is

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To express the given sum using sigma notation, you can write:

∑(from k=1 to 10) 1 / (k * (k + 2))

This signifies the sum of the expression 1 / (k * (k + 2)) as k ranges from 1 to 10.

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