in Combinatory edited by
136 views
0 votes
0 votes

The number of $4$ digit numbers which contain not more than two different digits is:

  1. $576$
  2. $567$
  3. $513$
  4. $504$
in Combinatory edited by
by
136 views

2 Comments

9*10*10*10 – 9*9*8*7-9*9*8*6 = 576

total – (4,3) diff digit
1
1
Please explain too
0
0

Please log in or register to answer this question.

Related questions