there are N students in a class their class teacher gave them a task of finding the average of the first N natural number each of them missed a different number while adding the average obtained by each student was 21 find N

• there are N students....average of first n natural is (N+1)/2...given average =21..therefore equate...N=41
• 7 years agoHelpfull: Yes(7) No(3)
• Avrg is n(n+1)/2.i.e: n(n+1)/2=21 substitute n=6 then we get avg 21.therefore n=6
• 5 years agoHelpfull: Yes(1) No(2)
• Answer is 41
• 7 years agoHelpfull: Yes(0) No(0)