Question
Assertion (A) : If $\frac{a}{b}=\frac{c}{d}=m$, then $\frac{a+c}{b+d}=m$.
Reason (R) : If for four numbers $a, b, c, d, a: b=c: d$, then $a b=c d$.
Reason (R) : If for four numbers $a, b, c, d, a: b=c: d$, then $a b=c d$.
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