The smallest 4-digit number having three different digits is
(A) 1102 (B) 1012 (C) 1020 (D) 1002
Answers
1002 is The smallest 4-digit number having three different digits
Step-by-step explanation:
The smallest 4-digit number having three different digits
1st lets identify 3 Smallest Digit
0 , 1 , 2
4Digit number ( hence one digit will be used twice)
A 4 Digit number will have 1000 , 100 , 10 , 1 Place
First Left most Digit ( 1000 place should be smallest)
but it can not be zero as then number will remain 3 Digit only
so
1000 place would be 1
Now for 100 Place smallest Digit 0 can be used
now for 10 place smallest Digit 0 can be used ( as we can use one digit twice)
Now we left with digit 2 and units place
so 2 will be at units place
so number = 1002 is the smallest 4-digit number having three different digits
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