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In our example the apex card is found by adding 4 + 2 and multiplying the sum of 6 by 5 for a product of 30. The other cards add up to 6 + 4 + 5 + 3 or 18. The sum of the 30 + 18 or 48. Add the digits together. The sum is 12. Add the digits together again and the sum is 3. The apex card should be a 3. |