Mathematics
A mobile number consists of ten digits. First four digits are 9, 9, 7 and 9. Make the smallest mobile number by using only one digit twice from the digits 8, 3, 5, 0, 6
Answer
The first four digits of the mobile number are 9, 9, 7 and 9.
So, the remaining six digits are to be filled using the digits 8, 3, 5, 0 and 6 (five digits), with one digit used twice (so total six digits).
For the smallest mobile number, use the smallest digit twice. So, use 0 twice. The other digits are 3, 5, 6 and 8.
Total six digits to be placed: 0, 0, 3, 5, 6, 8.
Arrange these six digits in ascending order: 0, 0, 3, 5, 6, 8.
Mobile number = 9 9 7 9 0 0 3 5 6 8
Hence, the smallest mobile number is 9979003568.
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