Robin randomly selects a number between 1 and 20 what is the probabilty that the number selected is the square of a natural number

Squares of Natural numbers from the range of 1 to 20:
1^2 = 1
2^2 = 4
3^2 = 9
4^2 = 16
(whereas 5^2 = 25 which is outside the range).

There are 4 numbers out of 20, so the probability is 4/20*100% = 20%

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Below are the choices:

1/2 
3/20 
3/10 
1/5 
1/3

Below is the solution:

Only 1,4,9,16 
4/20 = 1/5

21, i'm pretty sure it's right lol