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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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.

Hey webmaster! thanks for the info!

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.

2