1.

if the coefficient of rth (r+1) th and (r+2)th terms in the expansion of (1+x)^(n) are in A.P. then correct statements is :

Answer»

`N^(2)-n(4R+1)+4r^(2)-2=0`
`n^(2)+n(4r+1)+4r^(2)-2=0`
`n^(2)+n(4r+1)+4r^(2)+2=0`
`n^(2)+n(4r+1)+4r^(2)+2=0`

SOLUTION :N/a


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