Question: How many length 5 ternary strings contain exactly two 2s? How many length 5 binary strings over = {0,1,2} exactly two 2s? Let S Z

How many length 5 ternary strings contain exactly two 2s? How

How many length 5 ternary strings contain exactly two 2s? How many length 5 binary strings over = {0,1,2} exactly two 2s? Let S Z with |S= n. What is the maximum value of l{a+b: a,beSAb}

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