1. How many 4-digit numbers
can be formed from 1, 2, 3,
4, and 5 if no repetition is
allowed?
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1. How many 4-digit numbers
can be formed from 1, 2, 3,
4, and 5 if no repetition is
allowed?
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120 ways
SOLUTION:
n = 5
r = 4
P = 5*4*3*2
= 120 ways