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OpenStudy (anonymous):
in how many ways can teacher arrange 4 students in the front row of a classroom with a total of 30
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OpenStudy (xguardians):
27405 is the answer. You can use this calculator to help you with future problems: http://www.mathsisfun.com/combinatorics/combinations-permutations-calculator.html
OpenStudy (anonymous):
thank you (:
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