1.

If 1+ 5+ 12+ 22 + 35+ ….. +to n terms = ( n^(2) (n+1) )/(2)then n^( th) term of L.H.S is

Answer»

`(N ( 4n-1))/( 3) `
`(n(3n-1))/(2)`
`(n (3n+1))/(2)`
`(n (4n+1) )/(3)`

ANSWER :B


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