MathematicsNumber of 4-digit positive integer, if the product of their digit is divisible by 3, is

Number of 4-digit positive integer, if the product of their digit is divisible by 3, is


  1. A
    2700
  2. B
    6628
  3. C
    7704
  4. D
    5964 

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    Solution:

    First, we have to find 4-digit numbers whose digits product is divisible by 3.
    At least one of the digits is divisible by 3.
    Thus, no digit is divisible by 3 →0,3,6,9 must not appear.
    That is, Numbers should be formed using only 1,2,4,5,7,8=6 numbers.
     
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