Down syndrome

Down syndrome is one of the serious diseases caused by a gene mutation. Down syndrome occurs in approximately every 550-born child. Express the incidence of Down's syndrome in newborns at per mille.

Correct result:

p =  1.8182 ‰

Solution:

$p=1000\cdot {\displaystyle \frac{1}{550}}={\displaystyle \frac{20}{11}}=1\frac{9}{11}=1.8182\text{ ‰}$

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