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JEE Main201910 Apr 2019Morning ShiftMathematicsPermutation and CombinationActual

The number of 6 digit number that can be formed using the digits 0 , 1 , 2 , 5 , 7 and 9 which are divisible by 11 and no digit is repeated is:

Options

  1. A36
  2. B60
  3. C72
  4. D48

Correct answer

B. 60

Step-by-step solution

Only one possibility is there, ( 9,1 , 2 ) or ( 0,5 , 7 ) as in even or odd places ∴ Total number of required 6 digit numbers = ( 9 , 1 , 2 in odd and 0 , 5 , 7 in even places ) + ( 9 , 1 , 2 in even places and 0 , 5 , 7 in odd places ) = 3 ! × 3 ! + 3 !   – 2 × 3 ! = 36 + 24 = 60

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