True or false> in a physics class there are 9 juniors and 21 males. Then there must be 30 male juniors in this class.
false
Are all the males juniors and all the juniors males?
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False. The information given in the question does not provide enough information to determine the number of male juniors in the class.
To find the number of male juniors, we would need to know the total number of juniors in the class and the number of males in the class separately. The fact that there are 9 juniors and 21 males does not necessarily mean that there are 30 male juniors. It is possible that some of the males are not juniors or that there are additional male students in the class who are not included in the given figures.