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Grade: 12th Pass
        

find the number of 6 digits number that ends with 21 (as.537621) , with out repetition of digits .

7 years ago

Answers : (1)

Sher Mohammad
IIT Delhi
askIITians Faculty
174 Points
							last two digits are fixed so we have 8 no and 4 digits
first digit can't be zero so 7 choices for second digit 7 choices for third 6 for fourth 5

so total no.'s 7*7*6*5

Sher Mohammad
faculty askiitians
5 years ago
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