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"?

Answer 1

in 334
there is one pair of adjacent digits

another ex:
988, 772 ...
adjacent means one next to other...

Answer 2

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

Answer 3

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

Answer 4

digit 1 and digit 2 are adjacent pair of digits
digit 2 and digit 3 are adjacent pair of digits

Answer 5

oh just beside each other not consecutive.. ?

Answer 6

right, just besides each other in position

Answer 7

okay thanks!

Answer 8

welcome :)