Answer with explanation:
We have been given that blocks numbered 0 through 9 are placed in a box and a block is randomly picked.
Total numbers = 10
Now we will count the numbers in each category.
Prime numbers: 4 (2,3,5,7)
Odd numbers in prime : 3 (2,5,7)
Perfect square : 3 (1,4,9)
Greater than 0 and perfect square : 3 (1,4,9)
Now, the probability of picking an odd prime number is : Odd prime numbers are '3' and total are '10' , thus probability is :

The probability of picking a number greater than 0 that is also a perfect square is also
. (there are '3' perfect squares greater than 0)