Question 627919
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Hi,
In how many 4 digit integers does the digit 5 appear once and only once and as the largest digit?
Note: there are 5 digits < 5 , however, 0 cannot be in the first position  
5 in 1st position: {{{1*5*5*5 = 125}}} ways
5 in 2nd position: {{{4*1*5*5 = 100}}} ways
5 in 3rd position: {{{4*5*1*5 = 100}}} ways
5 in 4th position: {{{4*5*5*1 = 100}}} ways