Q. 1924.2( 4 Votes )

Using each of the digits 1, 2, 3 and 4 only once, determine the smallest 4 - digit number divisible by 4.

Answer :

For a number to be divisible by 4, the number formed by its last two digits should be divisible by 4.


possible last two digits here are 12, 24, 32


By taking 12, possible numbers = 3412 and 4312


By taking 24, possible numbers = 1324 and 3124


By taking 32, possible numbers = 4132 and 1432


Smallest number among above = 1324


Hence, using each of the digits 1, 2, 3 and 4 only once, the smallest 4 - digit number divisible by 4 = 1324


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