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<span>0.1428571428 would be the correct answer</span>
Answer:

Step-by-step explanation:

Or, if you mean (r+3Q)/h=t:

So you have a 50% chance to have a boy vs a girl (1/2). If you want 3 children, that would be 1/3*1/2= 1/6 or 16.67% chance