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Identify the parent function that can be used to graph the function f(x)= (1/4x)^3

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?