Afamily wants to have 4 children. design and do a simulation to determine the probability that, if they do have 4 children, they will have two boys and two girls. (hint: use coins.)

Let B represent boy and G represent girl, Then sample space

, BBBG, BBGB, BGBB, GBBB, BBGG, BGBG, GBBG, BGGB, GBGB, GGBB, BGGG, GBGG, GGBG, GGGB,

Two boys and two girls appeared in 6 situations.

Therefore, P(6 boys and 6 girls) = 6/16 = 3/8

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.