How many 3-digit positive integers are there, where each digit is positive, and no two adjacent digits are same?
Choose the correct choice from the following.
A) 576  B) 3024  C) 4096  D) 4608  E) 6561
First digit.. 9 posibilities   Second digit, 8 possibilities   third digit, 8 possibilities     9*8*8= 
<gadget id="calculator">  9*8*8</gadget>
<output>576</output>
576.   576
<result>A</result>
How many 3-digit positive integers are there, where each digit is positive, and no two adjacent digits are same?