5. Using the different digits, find the smallest
number of 4 digits in which 9 is in tens
place.
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Make the greatest and the smallest 4-digit numbers using any four different digits with conditions as given
a. Digit 7 is always at ones place
b. Digit 4 is always at tens place
c. Digit 9 is always at hundreds place
d. Digit 1 is always at housands place
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