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

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

Grade:12th Pass

1 Answers

Sher Mohammad IIT Delhi
askIITians Faculty 174 Points
9 years ago
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

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