1.

Thesumof thenumbers of then^(th) termof theseries(1) +(1+2) +(1+2+3) +(1 +2+3+4) +… (1 +2+3+….n)

Answer»

`"^(n+1)C_3`
`"^(n+1)C_2`
`"^nC_2`
`"^(n+2)C_3`

ANSWER :B


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