1.

The number of ways of choosing triplet( x,y,z) such that zge"max"{x,y} and x,y,zepsilon"1,2,……..n,n+1} is

Answer»

`.^(N+1)C_(3)+.^(n+2)C_(3)`
`1/6n(n+1)(2n+1)`
`1^(2)+2^(2)+…………..+n^(2)`
`2(.^(n+2)C_(3))-.^(n+1)C_(2)`

Answer :B,c,d


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