1.

Total number of ways in which n^(2)number of identical balls can be put in 'n' numbered boxes {1.2.3. . . . n} such that i^(th) box contains atleasti number of balls

Answer»

`""^(N^(2))C_(n - 1)`
`""^(n^(2)-1) C_(n-1)`
`(n^(2) + n -2)/(2)C_(n-1)`
`n !`

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