What is the smallest four digit number formed by using the digits 3, 5, 0, 6?

Correct option is D

Given:

We need to find the smallest four-digit number using the digits 3, 5, 0, and 6.

Concept Used:

To form the smallest four-digit number:

The leftmost digit must be nonzero (since a four-digit number cannot start with 0).

The remaining digits should be arranged in ascending order.

Solution:

The available digits are 3, 5, 0, and 6.

The smallest nonzero digit is 3, so it should be the first digit.

The remaining digits (0, 5, and 6) should be arranged in ascending order.

Thus, the smallest number formed is 3056.

Option (d) is right.