Number of permutations of and 9 taken all at a time are such that the digit 1 appearing somewhere to the left of 2 3 appearing to the left of 4 and 5 somewhere to the left of 6, is then the value of is |

Number of permutations of and 9 taken all at a time are such that the digit 1 appearing somewhere to the left of 2 3 appearing to the left of 4 and 5 somewhere to the left of 6, is then the value of is |

1 Answer

127 votes

Number of digits are 9 Select 2 places for the digit 1 and 2 in ways From the remaining 7 places select any two places for 3 and 4 in ways And from the remaining 5 places select any two for 5 and 6 in ways Now, the remaining 3 digits can be filled in Ways Total ways |

127 votes

127