THE SUM OF
[tex] \frac{a}{a + b} \: \frac{b}{a + b} [/tex]
IS EQUAL TO


A.
[tex] \frac{ab}{a + b}[/tex]
B.
[tex] \frac{ {a}^{2 \: + \: {b}^{2} } }{a + b} [/tex]
C.
[tex]0[/tex]
D.
[tex]1[/tex]

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