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Take 1 pill from ist jar, 2 pills from 2nd jar, 3 from 3rd , 4 from 4th jar and 5 from 5th jar.Total -15 pills.They should weigh 150 gms if each pill is of 10 gm. Find the diff of actual wt with ref to 150 gm.If wt is less bu 1 gm, it means one pill is of 9 gm. so 1st jar contains contaminated pills having wt of 9 gms each.like this we can find cont. jar.
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