if f(x) =x(x-1)/2 then find f(x+2)
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f ( x + 2 ) = ( x + 2) [ ( x+ 2) - 1 ] / 2
=> ( x + 2 ) [ x + 1 ] / 2
=> ( x + 2 ) ( x + 1 ) / 2
=> ( x + 2 ) [ x + 1 ] / 2
=> ( x + 2 ) ( x + 1 ) / 2
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