1.

The value of the sum1.2.3+2.3.4+3.4.5+… upto n terms is equal to

Answer»

`N (n+1) (n+2) (3n+5)//12`
`n (n+1) (n+2) (n+3)//4`
`2n(n+1) (n+2) (n+3)`
`n (n+1) (n+2) (3n+1)//12`

Answer :B


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