Which is the least valid way to stimulate how many boys and girls are in a random sample of 20 students from a school that is half boys and half girls?
A. Flip a coin 20 times, assigning one out come to boys and the other to girls
B. Drop 20 coin at once and count the number of each outcome
C. Count how many boys and girls are in your mat class and use a proportion
D. Have a calculator generate 20 random integers and count the number of even and odd integers
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