Question

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

Answer 1

the squares btwn 1 to 20 are 1,4,9,16

the probablity of getting a square of a natural no. is 4/20

i.e.1/5

Answer 2

1 (1x1=1), 4 (2x2=4), 9 (3x3=9), 16 (4x4=16) and the Probability is 4 out of 20 = 4 / 20, simplified is 1 / 5 (4 into 4 is 1, 4 into 20 is 5).

Therefore the probability that the number Robin selects randomly is a square of a natural number is 1/5.