00:01
In this question, solution here is, here to find 6 digit number, we have to use digit 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.
00:24
Now according to the given condition, the digit 7 and 8 must be next to each other.
00:46
Therefore, we consider it as one single digit, one single digit, so it has 5 choices, 5 choices and this digit arranged itself in 2 factorial way, in 2 factorial way.
01:19
Now the remaining 4 places, 4 places are filled in 8 p4 way.
01:31
Therefore, total number of 6 digit, total number of 6 digits, number with number with possible leading 0, leading 0 and the digit, digit 7 and 8 must appear in the number and must be next to each other, next to each other...