Question

Fill in the blank with smallest digit to make $90909....$divisible by $5.$

Answer 1

Since as we know that the last digit of unit place is $0$ and $5$then number is divisible by $5$. Ex -: $5,10,15,20,25,.......$

But the smallest digit to be placed in blank space is $0$.

Hence, the smallest digit to be placed is blank space $0$ then digit $0$ to make $90909....$ divisible by $5$.