Robin randomly selects a number between 1 and 20 what is the probabilty that the number selected is the square of a natural numb
er
2 answers:
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Below are the choices:
1/2
<span>3/20 </span>
<span>3/10 </span>
<span>1/5 </span>
1/3
Below is the solution:
Only 1,4,9,16
4/20 = 1/5
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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