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A teacher wants to select the class monitorin a class of 30 boys and 20 girls. In howmany ways can the monitor be selected if themonitor must be a girl?Apos by putting |
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Answer» a class monitor can be selected in 20ways. i.e 20!/19!×1!
a class monitor can be selected in 20 ways.¡.e. 20!/19!×1! |
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