The second grade teacher posed a simple enough problem to the class. "there are four blackbirds sitting in a tree. you take a slingshot and shoot one of them. how many are left? " "three," answered the first 7-year old boy with certainty. "one subtracted from four leaves three." "zero," answered the second 7-year old boy with equal certainty. "if you shoot one bird, the others will fly away."

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step-by-step explanation:

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation: