Question

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

Answer 1

Answer:

1324

Step-by-step explanation:

In general, to get the smallest 4 digit no. using 4 digits only once, we place the nos. in ascending order. But here, if we do so, then the no. formed (1234) will not be divisible by 4, because a no. is divisible by 4 only if its last 2 digits are divisible by 4. So, here, we interchange the positions of 2 and 3, i.e we make 1234 → 1324. Thus we get the smallest no. using each of the digits 1, 2, 3 and 4 only once, which is divisible by 4.