Correct option (b) 192
Explanation:
The integer greater than 6000 may be of 4 digit or 5 digit So, here two cases arise.
Case I When number is of 4 digit.
Four digit number can starts from 6, 7 or 8
Thus, total number of 4 digit number, which are greater than 6000 = 3 x 4 x 3 x 2 = 72
Case ll When number is of 5 digit.
Total number of five.digit number which are greater than 6000 = 5! = 120
.'. Total number of integers = 72 + 120 = 192