The value of underset(r=0)overset(40)sum...

The value of `underset(r=0)overset(40)sumr.^(40)C_(r).^(30)C_(r)` is

`40^(69)C_(29)`

`40^(70)C_(30)`

`""^(69)C_(29)`

`""^(70)C_(30)`

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