1.

""^(35)C_(8)+sum_(r=1)^(1)""^(42-r)C_(7)+sum_(s=1)^(5)""^(47-s)C_(40-s) , is

Answer»

`""^(46)C_(7)`
`""46C_(8)`
`""^(47)C_(7)`
`""^(47)C_(8)`

Answer :D


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