formulas available in richtextbox need to add in available word file

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Hi,
I am trying to export some formulas which are written in richtext box.
I want to add this formula in selected doc file.

eg. (x+a)^n=∑_(k=0)^n▒〖(n¦k) x^k a^(n-k) 〗

this a sample formula. I want to append it in selected document file.

For this export code I am using Novacode.DocX dll.

Hope for your reply.

Thanks in Advance.