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Pat has $$7$$ identical pieces of paper. One or more of the pieces are cut into $$7$$parts each, then one or more of the smaller pieces are cut into $$7$$ parts each again. Which of the following could be the total number of pieces of paper after these cuts have been made?
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How many two-digit positive integers are equal to the product of two different prime numbers greater than $$0$$?
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$$p$$ and $$r$$ are both prime numbers
$$pr^2 \lt 450$$
What is the greatest possible value of $$r$$?
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