You have a function rand(3) which generates random integers from 1 to 3. Using this function, construct another function rand(9) which generates random integers from 1 to 9.
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You have a function rand(3) which generates random integers from 1 to 3. Using this function, construct another function rand(9) which generates random integers from 1 to 9.
Using rand(3) twice, one can generate 3^2 pairs of integers, i.e. (1,1), (1,2), …, (3,3). Assigning each pair to one of the values [1,9] (e.g. (1,1) to 1, (1,2) to 2 etc.) will give you rand(9). Symbolically: rand(9):=(rand(3),rand(3)).