$$A = \frac { 9 } { 10 } \times \frac { 10 } { 11 } \times \frac { 11 } { 12 }$$
$A=\frac{3}{4}=0.75$
$$A=\frac{9\times 10}{10\times 11}\times \frac{11}{12}$$
$$A=\frac{9}{11}\times \frac{11}{12}$$
$$A=\frac{9\times 11}{11\times 12}$$
$$A=\frac{9}{12}$$
$$A=\frac{3}{4}$$
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$A≔\frac{3}{4}$
