Balls

From the bag with numbered balls (numbers 1,2,3,. ..20) we pick one ball. What is the probability of choosing a number containing 1?

Result

p =  0.55

Solution:

p=1+1020=1120=0.55p=\dfrac{ 1+10 }{ 20 }=\dfrac{ 11 }{ 20 }=0.55



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