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16 Jul 2009 15:22:23 IST
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Let there be n students in 1st row.There are n-3 students in 2nd row, n-6 in 3rd row etc etcProof:(By contradiction)Let us assume that there are 6 rows.There for the sum of total number of students = 6n-45(Hope u got this)But 6n-45=630Therefore 6n = 675Which is not possible.Therefore ,n=6 is not possible.Hope U understood.If not pls reply
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