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Combinations with restrictions

Questions (2)

use the formula nPr to solvehow many arrangements can be made using four of the letters of the word COMBINE if no letter is to
1. 4 answers
2. asked by marie
3. 2,885 views
I'm having trouble on how to figure something out. The question says a pizza place uses 5 toppings (a,b,c,d,e). How many
1. 9 answers
2. asked by Vicky
3. 587 views