There are 9 coins.

There are 9 coins. 8 are of 1 gm and 1 is of 2 grams. How will you find out the heavier coin in minimum number of weighing and how many weighing it will need?

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Vineet Patawari

Hi, I'm Vineet Patawari. I fell in love with numbers after being scared of them for quite some time. Now, I'm here to make you feel comfortable with numbers and help you get rid of Math Phobia!

4 thoughts to “There are 9 coins.”

  1. 2 weighings.
    divide in groups of 3.
    pick 2 groups at random.
    weigh.—->1
    if unequal choose heavier lot for reweighing or if equal choose the left out lot for reweighing.
    pick 2 coins at random and weigh.
    if unequal u hav got d heavier 1 if equal the leftout 1 is the wanted.

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