Odd cardinal altitude or flight levels at intervals of 2,000 feetД®ven cardinal altitude or flight levels at intervals of 2,000 feet Unidentified Flying Object (UFO) Reports.Special Use, ATC-Assigned Airspace, and Stationary ALTRVs.Terminal Radar Service Area (TRSA) - Terminal.Basic Radar Service to VFR Aircraft - Terminal.Initial Separation of Departing and Arriving Aircraft.Initial Separation of Successive Departing Aircraft.Standard Terminal Automation Replacement System (STARS)-Terminal.Use of PAR for Approach Monitoring - Terminal.Automatic Terminal Information Service Procedures.So we have just one possibility - the only solution - 2 and 9.

The same reasoning is used for eliminating sum 12 (because 5 and 7).

And so the sum can not be 10 (because 7 and 3) - the second student knew, that the first student does not know the sum - but if the sum was 10, then the first student could have known the sum if the pair was 7 and 3. Let's eliminate the sums, which can be created using a unique combination of numbers - if the sum is clear when knowing the product (this could have been done earlier, but it wouldn't be so exciting) - because the second student knew, that his sum is not created with such a pair of numbers. The second student (knowing the sum) knew, that the first student (knowing the product) does not know the sum and he thought that the first student does not know that the sum is smaller than 14. NO - it is impossible to create any pair of numbers from the given sum, where there would be at least one sum (created from their product) bigger than 14 NO - it is impossible to create any pair of numbers from the given sum, where there would be at least one sum (created from their product) bigger than 14Д¤ 5. NO - it is impossible to create any pair of numbers from the given sum, where there would be at least one sum (created from their product) bigger than 14Д¤ 4. NO - it is impossible to create any pair of numbers from the given sum, where there would be at least one sum (created from their product) bigger than 14ДЈ 6. if 4 and 4, then there is no sum - created from their product 16 - bigger than 14 - eg. NO - it is impossible to create any pair of numbers from the given sum, where there would be at least one sum (created from their product) bigger than 14 (it is impossible to create a pair of numbers from sum 8, so that the product would have an alternative sum bigger than 14. So there are the following combinations left:Дў 6. NO - the product does not have all possible sums smaller than 14 NO - the product does not have all possible sums smaller than 14Д¦ 7. NO - the product does not have all possible sums smaller than 14Д¦ 6. NO - the first student would have known the sum as wellДҐ 8. NO - the product does not have all possible sums smaller than 14ДҐ 7. NO - the first student would have known the sum as wellДҐ 6. NO - the product does not have all possible sums smaller than 14ДҐ 5. NO - the product does not have all possible sums smaller than 14Д¤ 9. NO - the product does not have all possible sums smaller than 14Д¤ 8. NO - the product does not have all possible sums smaller than 14Д¤ 7. NO - the product does not have all possible sums smaller than 14Д¤ 6. NO - the first student would have known the sum as wellДЈ 10. NO - the product does not have all possible sums smaller than 14 (eg. NO - the first student would have known the sum as wellДЈ 8. NO - the first student would have known the sum as wellДЈ 7. NO - the first student would have known the sum as wellДЈ 5. NO - the first student would have known the sum as wellДЈ 3. NO - the first student would have known the sum as wellДў 11.

NO - the first student would have known the sum as wellДў 7. NO - the first student would have known the sum as wellДў 5. NO - the first student would have known the sum as wellДў 4. NO - the first student would have known the sum as wellДў 3. The sum is smaller than 14 (for natural numbers bigger than 1), so the following combinations are possible:Дў 2. First student knows their product and the other one knows their sum. There shall be two natural numbers bigger than 1.

Three five zero zero