Vemuri's Brain Teaser-1

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I want to present a series of brain teaser problems collected from various sources, for the benefit of aspirants looking for tougher-level questions . Here it goes the first one..... There are eight bags of rice looking alike, seven of which ...
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I want to present a series of brain teaser problems collected from various sources, for the benefit of aspirants looking for tougher-level questions . Here it goes the first one.....

There are eight bags of rice looking alike, seven of which have equal weight and one is slightly heavier. The weighing balance is of unlimited capacity. Using this balance, the minimum number of weighings required to identify the heavier bag is
(A) 2 (B) 3 (C) 4 (D) 5 (E) 8

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