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It costs 15.00 for two adults and two children.
Einstein married Mileva Marić and had three children, a daughter Lieser and two sons, Hans Albert and Eduard Tete. After their divorce in 1919, Einstein married Elsa Löwenthal in the same year. They had no children of their own, instead they raised Elsa's two children from her previous marriage.
two bio-pesticides
There is no simple answer to the question because the children's genders are not independent events. They depend on the parents' ages and their genes. A family of 4 is a family of two parents and two children. The probability that both children are girls is 0.2334