How many 5-digit positive integers are there, where each digit is positive, and no two adjacent digits are same?
Choose the most appropriate option:  A) 1236  B) 3024  C) 4096  D) 4608  E) 36864
First digit.. 9 posibilities   Second digit, 8 possibilities   third digit, 8 possibilities   Fourth digit, 8 possibilities.   9*8*8*8*8 = 36,864.   36864
<result>E</result>
How many 5-digit positive integers are there, where each digit is positive, and no two adjacent digits are same?