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B. Solve each permutation problem completely using the fundamental
counting principle. Show your complete solutions.

1. In how many ways can you file 12 folders, one after another, in a drawer?
Solution:

2. How many three-digit numbers can be written from the digits 1,2,3, and 4,
if repetition of digits is allowed?
Solution:​


Sagot :

Step-by-step explanation:

problem # 2 (answer)

No. of digits (n) = 4 and places to be filled

(r) = 3

If repetition of digits is allowed

the No. of permutations = n^r

= 4³

= 64 (answer)