Making Dollar riddle
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You are given “n” coins of denominations 1, 0.5, 0.25, 0.1, 0.05 and 0.01 (6n coins altogether). You are then asked to choose n out of these 6n coins that sum up to exactly 1. What is the smallest n for which this is impossible? 
Best answer
n=1; just select the coin with denominations 1
3
Your answer is not correct.
You can make 1 with a coin of 0.5 and 2 of 0.25, using 3 coins.
My first answer was wrong as well because I read the possible instead of impossible.
I come up to 76 coins (6 x 0.05 and 70 x 0.01).
I think the answer is 77. With 75 coins of 0.01 you can use only 2 coins to make 0.25
You are right. I realised it just after commenting it but didn’t knew how to delete it ?
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