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Earn +20 ptsQ: How many combinations of 3 students can a teacher choose from 32 students?
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How many combinations of 4 students can a teacher choose from 30 students?
The answer is 30C4 = 30*29*28*27/(4*3*2*1) = 27,405
How many combinations of 4 person committees can be formed in a class of 20 students?
There are 4845 ways to choose 4 people out of 20 20 choose 4 = 20! / (4!16!)
A school has 825 students and 55 teachers. How many students are there per teacher?
There are: 825/55 = 15 students per teacher
If a password is 30 characters how many combinations are possible you have been out of school 50 years so please no formulas about X zillion will also be good?
that depends on how many different characters you have to choose from. if the password was made of numbers only then you would have 1030 different combinations.
A chemistry teacher has a 560-cm length of magnesium ribbon. For a class experiment each student requires an 8.5-cm length of the ribbon. How many students may receive the required length?
65 students
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