1.

Find the position of the given number among the numbers made of 4 and 7.

Answer»

Consider a series of numbers composed of only digits 4 and 7. The first few numbers in the series are 4, 7, 44, 47, 74, 77, 444, etc. Given a number constructed by 4, 7 digits only, we need to find the position of this number in this series.



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