How many numbers greater than 4000 can be formed with thebsigits 2,3,4,5 and 6 if no digitnis used more than once in a number? Note: there is no '1'.
mmm
All 5 digit numbers 5! = 120
All 4 digit numbers begining with 4,5 of 6: 3*4*3*2 = 3*4! = 72
Total = 120+72 = 192
