1.

underset(r=0)overset(10)sum (40-r)C_(5)=

Answer»

`""^(41)C_(5)-""^(30)C_(5)`
`""^(41)C_(6)-""^(30)C_(6)`
`""^(41)C_(5)+""^(30)C_(5)`
`""^(41)C_(6)`

Answer :B


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