39. A class consist of 7 rows. The teacher release laughing gas and a mischievous student release a tear gas of molecular weight 176 from near most. The student of which row from the first will weep and

39. A class consist of 7 rows. The teacher release laughing gas and a mischievous student release a tear gas of molecular weight 176 from near most. The student of which row from the first will weep and smile simultaneously

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39. A class consist of 7 rows. The teacher release laughing gas and a mischievous student release a tear gas of molecular weight 176 from near most. The student of which row fro…

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