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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


For Smallest number -
(a) 7000
(b) 1400
(c) 1190
(d) 1111
For Largest number -
(a) 7999
(b) 9499
(c) 9999
(d) 9991
1 5 1
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