



 
Hi Sarah, As I read this you are to choose one number from each column to get a set of 5 numbers. If this is correct then there are 5 ways to choose a number from the first column and regardless of which number you choose you have 5 ways to choose a number from the second column. Hence there are $5 \times 5 = 5^2$ ways to create a set of 2 numbers, one from each of the first two columns. For each of these $5^2$ ways to choose a 2 number set there are 5 ways to choose a number from the third column and hence there are $5^2 \times 5 = 5^3$ ways to choose a 3 number set from the first three columns. I hope this helps. let me know if I have misinterpreted your question. Penny 



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