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mr morris needs two students to help with a demonstration for her class of 12 girls and 14 boys. She randomly chooses two students. What is probability that she choose two girls

Sagot :

AL2006
The class starts out with 26 students, of whom 12 are girls and, perhaps unlike Mr Morris, are sure of it. The probability of the first random choice being a girl is 12/26. If successful, there are now 25 students left, of whom 11 are girls. The probability of a girl on the 2nd random choice is 11/25. The probability that BOTH random choices are successful is (12/26) x (11/25). That's (132/650), or about 20.31% (rounded).
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