Class 11

Math

JEE Main Questions

Permutations and Combinations

Number of permutations of 1, 2, 3, 4, 5, 6, 7, 8, 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 $k×7!$ Then the value of $k$ is _________.