How many 3-digit positive integers are there in which adjacent digits are not the same?

what does it mean when it says "adjacent digits"?

Question

How many 3-digit positive integers are there in which adjacent digits are not the same?

what does it mean when it says "adjacent digits"?

hartnn · Answer

in 334 
there is one pair of adjacent digits 

another ex: 
988, 772 ...
adjacent means one next to other...

anonymous · Answer

can you give one more example? i'm not sure if i understand it right

anonymous · Answer

is it like 32 or 45 or 789 but not 82 or 51 ?

hartnn · Answer

|dw:1409981570652:dw|

digit 1 and digit 2 are adjacent pair of digits
digit 2 and digit 3 are adjacent pair of digits

anonymous · Answer

oh just beside each other not consecutive.. ?

hartnn · Answer

right, just besides each other in position

anonymous · Answer

okay thanks!

hartnn · Answer

welcome :)