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Interview Question for Financial Applications Engineer at Bloomberg L.P.:
Dec 14, 2011
Given 8 pennies, 7 of which weigh the same, and one of which is slightly heavier than all the others - state the minimum number of times you could use a balance scale to determine which penny was the heavier one.
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by Anonymous:
1) Weigh the two piles of three
a)if they weight equal.
aa) then weigh each of the last two
b) if one weighs more
bb) then place one penny on each side leaving one out
bb) if they weigh the same, the left over penny is it.