Quicker Maths
26Oct/094

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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  1. Hey webmaster! thanks for the info!

  2. 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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