How many permutations can be made using the letters from paralell

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1.How many permutations can be made using the letters from PARALELL?

Math

2.I have a doubt with permutations and combinations. here's the question in how many ways can a person descend 'n' stairs. if ...

on descend 'n' stairs. if he can descend descend 1 step at a time, or 2 steps at a time, or 3 steps at a time at his will. Provided he can descend 3 stairs only once in the entire descend.

Math

1.AU MAT 120 Systems of Linear Equations and Inequalities Discussion

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