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How well is your arithmetic intelligence developed? 2

How well is your arithmetic intelligence developed? 2 You think you can solve any problem? What about arithmetic problems? Do this test and you will see what's your arithmetic intelligence's level!

Question 1 from 10: What is the sum of all digits (not numbers) that make up the sequence of 1, 2, 3, 4 ,. . . up to 99?
Choose the right answer and then click the button     Next question ยป