Binomial coefficient calculation error in Maple

[opus]

TL;DR

Help with writing Maple program to calculate Binomial Coefficients,

Please see attached image. I'm not sure why I'm getting this error because this is the format I have used to write programs in Maple before. Any ideas? I'm new to this so not sure how to independently trouble shoot or problem solve this,
Thanks!

 

[DrClaude]

The parentheses are not balanced.

 

[opus]

Whoops! Thanks DrClaude!