Question: How would I code this expression ( you can remove the a^rb^n-r if it doesn't work with it) in Python? I just need the summation

How would I code this expression ( you can remove the a^rb^n-rHow would I code this expression ( you can remove the a^rb^n-r if it doesn't work with it) in Python? I just need the summation when n=4 and r from 0-4 mainly of the right side with the factorials. Thank you!

n n! a*b=r r!(n - r)! " =

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