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How many numbers can be expressed as the sum of two or more distinct elements of the set $\{ 0, 1, 2, 4, 8, 16 \}$?

 

This question has been posted before but I am very confused about the solution

 Jun 27, 2021
 #1
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There are 6 + C(6,2) = 21 possible numbers.

 Jun 27, 2021

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