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The number of ordered triplets of positi...

The number of ordered triplets of positive integers which satisfy the inequality `20lex+y+zle50` is
(A) `""^50C_3- "^19C_3`
(B) ` ""^50C_2-"^19C_2`
(C) `""^51C_3-"^20C_3`
(D) none of these

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