You can put this solution on YOUR website!
If NONE OF THE CHILDREN ARE BOYS, this means that EACH CHILD MUST BE A GIRL!
The probability of this happening is
This answer is
. I'm absolutely sure that this is correct, but it doesn't match any of your multiple choice answers. Perhaps you've copied something wrong???
Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus