For example, we have the digits 1,5,8
How many two-digit numbers can I have?
15 18 51, 81, 58 ,85
Arrangement numbers,are the number of ways
that a number of things can be ordered or arranged.
What is the mathematical formula
for calculating Arrangement numbers?
(n)k= n!/(n-k)!
(3)2=3!/(3-2)!=3!/1!=
1X2X3/ 1=6/1=6
Answer is 6 two digit numbers.
By Panos Kalliantasis
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