Legendre Differential equation, n(n-1) or n(n+1)

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I am confused regarding the Legendre Differential Equations' coefficients. In some books its,

$(1-x^2)y''-2xy'+n(n-1)y=0$

and somewhere it is,

$(1-x^2)y''-2xy'+n(n+1)y=0$

what is its correct form?