explain the general principle using algebra
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it's (a+a^2)/{a×(a+1)} =1
let if a=2 then
(2+2^2)/2×(2+1)
(2+4)/(2×3)
6/6=1
let if a=2 then
(2+2^2)/2×(2+1)
(2+4)/(2×3)
6/6=1
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