Javier has two sets of cards. Each set contains 4 cards, one marked $$\(\mathbf{A}\)$$, one marked $$\(\mathbf{B}\)$$, one marked $$\(\mathbf{C}\)$$ and one marked $$\(\mathbf{D}\)$$. Javier is going to take at random one card from each set, note the letter on each card and replace the cards. He is going to do this a total of 80 times. (b) Work out an estimate for the number of times that Javier will take at least one card marked $$\(\mathbf{C}\)$$. (2)

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