overset(10)underset(r=0)sum^(40-r)C(5) i...

`overset(10)underset(r=0)sum^(40-r)C_(5)` is equal to

`""^(41)C_(5)-""^(30)C_(5)`

`""^(41)C_(6)-""^(30)C_(6)`

`""^(41)C_(5)+""^(30)C_(5)`

`""^(41)C_(6)`

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