Question 249766
A pharmacist uses 5 seperate weights. 1G, 2G,4G,8G,16G. If the pharmacist can combine these weights to create new weights, how many different weights are possible? 
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32, if you count zero.  31 if not.
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The weights are:
{{{(2^0) to (2^4)}}}
The possible combinations are any number in binary from 0 to 31 grams.