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OpenStudy (anonymous):
How many 4-digit numbers can you write having 2 sets of repeated digits (eg: 2323)
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OpenStudy (paxpolaris):
is 0101 an acceptable answer?
OpenStudy (paxpolaris):
Assuming 0011 or 0101 counts as a 4 digit number.... Assuming the two digits are A and B
OpenStudy (paxpolaris):
10 choices for A 9 choices for B AABB ABAB ABBA BAAB BABA BBAA 6 ways to arrange the digits.
OpenStudy (paxpolaris):
sorry.. we should restrict A to being the first digit so 3 possible ways to arrange the numbers. AABB ABAB ABBA son your answers is 10*9*3
OpenStudy (paxpolaris):
(if A can't be 0 your answer will be 9*9*3
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